feat(settings): refactor LLM config to table inline-edit UI

- Remove old card-based model list UI
- Add LLM config state management (expandedRow, editingSnapshot)
- Implement addModel/removeModel with embedding/rerank constraints
- Implement updateModel, testModel, saveModel, toggleRow, cancelEdit
- Add showRequiredWarning computed property
- Rewrite template with 4 LLM type sections using LLMTableRow
- Add styles for llm-type-section, warning-bar, etc.
- Update loadSettings to initialize with empty arrays

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/views/SettingsView.vue

@@ -2,20 +2,31 @@
 import { ref, onMounted, computed } from 'vue'
 import { settingsApi, type LLMConfig, type SchedulerConfig, type LLMModelConfig, type LLMProvider } from '@/api/settings'
 import LLMTableRow from '@/components/settings/LLMTableRow.vue'
-import { Save, Eye, EyeOff, Play, RotateCcw, Plus, Trash2, X, Check } from 'lucide-vue-next'
+import { Save, RotateCcw, Plus } from 'lucide-vue-next'
 
 // 状态
 const loading = ref(false)
 const saving = ref(false)
-const showApiKey = ref<Record<string, boolean>>({})
 const savingModel = ref<string | null>(null) // 当前正在保存的模型 key
-const modelSaveSuccess = ref<string | null>(null) // 刚刚保存成功的模型 key
 const toast = ref<{ show: boolean; message: string; type: 'success' | 'error' }>({
   show: false,
   message: '',
   type: 'success'
 })
 
+// 展开的行
+const expandedRow = ref<string | null>(null) // 'chat-0', 'vlm-0' 等
+
+// 当前正在编辑的模型快照（用于取消时恢复）
+const editingSnapshot = ref<{ type: string; index: number; data: LLMModelConfig } | null>(null)
+
+// 必填警告
+const showRequiredWarning = computed(() => {
+  return llmConfig.value.chat.length === 0 ||
+         llmConfig.value.embedding.length === 0 ||
+         llmConfig.value.rerank.length === 0
+})
+
 // 用户资料
 const profile = ref({
   email: '',
@@ -69,11 +80,6 @@ function isModelDirty(type: string, index: number): boolean {
   return JSON.stringify(original) !== JSON.stringify(current)
 }
 
-// 获取模型唯一标识
-function getModelKey(type: string, index: number): string {
-  return `${type}-${index}`
-}
-
 // 创建空的模型配置
 function createEmptyModel(type: string): LLMModelConfig {
   return {
@@ -91,19 +97,64 @@ function addModel(type: string) {
   if (!llmConfig.value[type as keyof LLMConfig]) {
     llmConfig.value[type as keyof LLMConfig] = []
   }
-  llmConfig.value[type as keyof LLMConfig]!.push(createEmptyModel(type))
+  // embedding/rerank 最多 1 个
+  if ((type === 'embedding' || type === 'rerank') &&
+      llmConfig.value[type as keyof LLMConfig]!.length >= 1) {
+    showToast(`${type === 'embedding' ? 'Embedding' : 'Rerank'} 最多配置 1 个`, 'error')
+    return
+  }
+  const newModel = createEmptyModel(type)
+  llmConfig.value[type as keyof LLMConfig]!.push(newModel)
+  // 自动展开新添加的行
+  const newIndex = llmConfig.value[type as keyof LLMConfig]!.length - 1
+  expandedRow.value = getRowKey(type, newIndex)
+  editingSnapshot.value = { type, index: newIndex, data: JSON.parse(JSON.stringify(newModel)) }
 }
 
 // 删除模型
 function removeModel(type: string, index: number) {
+  // embedding/rerank 为知识库必填，至少保留 1 个
+  if ((type === 'embedding' || type === 'rerank') &&
+      llmConfig.value[type as keyof LLMConfig]!.length <= 1) {
+    showToast(`${type === 'embedding' ? 'Embedding' : 'Rerank'} 为知识库必填，至少保留 1 个`, 'error')
+    return
+  }
   llmConfig.value[type as keyof LLMConfig]!.splice(index, 1)
+  expandedRow.value = null
+  editingSnapshot.value = null
 }
 
-// 复制模型
-function duplicateModel(type: string, index: number) {
-  const model = llmConfig.value[type as keyof LLMConfig]![index]
-  const copy = { ...model, name: `${model.name}-copy-${Date.now()}` }
-  llmConfig.value[type as keyof LLMConfig]!.push(copy)
+// 行标识
+function getRowKey(type: string, index: number): string {
+  return `${type}-${index}`
+}
+
+// 切换行展开
+function toggleRow(type: string, index: number, model: LLMModelConfig) {
+  const key = getRowKey(type, index)
+  if (expandedRow.value === key) {
+    expandedRow.value = null
+    editingSnapshot.value = null
+  } else {
+    // 保存快照用于取消
+    editingSnapshot.value = { type, index, data: JSON.parse(JSON.stringify(model)) }
+    expandedRow.value = key
+  }
+}
+
+// 取消编辑
+function cancelEdit(type: string, index: number) {
+  if (editingSnapshot.value && editingSnapshot.value.type === type && editingSnapshot.value.index === index) {
+    // 恢复原始数据
+    llmConfig.value[type as keyof LLMConfig]![index] = editingSnapshot.value.data
+  }
+  expandedRow.value = null
+  editingSnapshot.value = null
+}
+
+// 更新模型
+function updateModel(type: string, index: number, model: LLMModelConfig) {
+  llmConfig.value[type as keyof LLMConfig]![index] = model
 }
 
 // 加载设置
@@ -119,16 +170,15 @@ async function loadSettings() {
     originalProfile.value = { ...profile.value }
 
     // 加载 LLM 配置
-    if (res.data.llm_config && Object.keys(res.data.llm_config).length > 0) {
-      llmConfig.value = res.data.llm_config as LLMConfig
-    } else {
-      // 默认添加一个空配置
+    if (res.data.llm_config) {
       llmConfig.value = {
-        chat: [createEmptyModel('chat')],
-        vlm: [createEmptyModel('vlm')],
-        embedding: [createEmptyModel('embedding')],
-        rerank: [createEmptyModel('rerank')]
+        chat: res.data.llm_config.chat || [],
+        vlm: res.data.llm_config.vlm || [],
+        embedding: res.data.llm_config.embedding || [],
+        rerank: res.data.llm_config.rerank || []
       }
+    } else {
+      llmConfig.value = { chat: [], vlm: [], embedding: [], rerank: [] }
     }
     originalLlmConfig.value = JSON.parse(JSON.stringify(llmConfig.value))
 
@@ -180,7 +230,7 @@ async function saveLLM() {
 
 // 保存单个模型
 async function saveModel(type: string, index: number) {
-  const key = getModelKey(type, index)
+  const key = getRowKey(type, index)
   savingModel.value = key
   try {
     // 发送完整的配置（包含该类型的所有模型）
@@ -189,13 +239,10 @@ async function saveModel(type: string, index: number) {
     // 更新原始配置（深拷贝当前完整配置）
     originalLlmConfig.value = JSON.parse(JSON.stringify(llmConfig.value))
 
-    // 显示成功状态
-    modelSaveSuccess.value = key
-    setTimeout(() => {
-      if (modelSaveSuccess.value === key) {
-        modelSaveSuccess.value = null
-      }
-    }, 1500)
+    // 关闭展开的行
+    expandedRow.value = null
+    editingSnapshot.value = null
+    showToast('保存成功')
   } catch (e: unknown) {
     const msg = (e as { response?: { data?: { detail?: string } } })?.response?.data?.detail || '保存失败'
     showToast(msg, 'error')
@@ -205,15 +252,19 @@ async function saveModel(type: string, index: number) {
 }
 
 // 测试 LLM 连接
-async function testLLM(type: string, config: LLMModelConfig) {
+async function testModel(type: string, index: number, model: LLMModelConfig) {
   try {
-    const res = await settingsApi.testLLM({ type: type as any, ...config })
+    const res = await settingsApi.testLLM({ type: type as any, ...model })
     if (res.data.success) {
-      showToast(`连接成功: ${res.data.message}`)
+      // 测试通过，标记为可用
+      llmConfig.value[type as keyof LLMConfig]![index].enabled = true
+      showToast('连接成功')
     } else {
+      llmConfig.value[type as keyof LLMConfig]![index].enabled = false
       showToast(`连接失败: ${res.data.error}`, 'error')
     }
   } catch (e) {
+    llmConfig.value[type as keyof LLMConfig]![index].enabled = false
     showToast('测试连接失败', 'error')
   }
 }
@@ -273,8 +324,6 @@ function showToast(message: string, type: 'success' | 'error' = 'success') {
   }, 3000)
 }
 
-// LLM 类型列表
-const llmTypes = ['chat', 'vlm', 'embedding', 'rerank'] as const
 
 // 获取模型显示名称
 function getModelName(config: LLMModelConfig): string {
@@ -344,133 +393,109 @@ onMounted(loadSettings)
       </div>
 
       <!-- LLM Config Section -->
-      <div v-for="type in llmTypes" :key="type" class="settings-card">
+      <div class="settings-card">
         <div class="card-header">
-          <span class="card-title">{{ type.toUpperCase() }}</span>
-          <button class="add-btn" @click="addModel(type)">
-            <Plus :size="12" /> 添加模型
-          </button>
+          <span class="card-title">// LLM CONFIGURATION</span>
         </div>
 
-        <!-- 模型列表 -->
-        <div v-if="llmConfig[type] && llmConfig[type]!.length > 0" class="model-list">
-          <div
-            v-for="(model, index) in llmConfig[type]"
-            :key="index"
-            class="model-item"
-            :class="{ disabled: !model.enabled }"
-          >
-            <div class="model-header">
-              <div class="model-name-group">
-                <input
-                  v-model="model.name"
-                  type="text"
-                  class="model-name-input"
-                  placeholder="模型名称"
-                />
-                <label class="model-enabled">
-                  <input type="checkbox" v-model="model.enabled" />
-                  <span class="checkbox-custom"></span>
-                  启用
-                </label>
-              </div>
-              <div class="model-actions">
-                <button
-                  class="icon-btn"
-                  :class="{
-                    'has-changes': isModelDirty(type, index),
-                    'is-saving': savingModel === getModelKey(type, index),
-                    'is-saved': modelSaveSuccess === getModelKey(type, index)
-                  }"
-                  @click="saveModel(type, index)"
-                  :title="isModelDirty(type, index) ? '保存更改' : '无更改'"
-                  :disabled="savingModel === getModelKey(type, index)"
-                >
-                  <div v-if="savingModel === getModelKey(type, index)" class="btn-spinner-sm"></div>
-                  <Check v-else-if="modelSaveSuccess === getModelKey(type, index)" :size="12" />
-                  <Save v-else :size="12" />
-                  <span v-if="isModelDirty(type, index) && modelSaveSuccess !== getModelKey(type, index)" class="unsaved-dot"></span>
-                </button>
-                <button class="icon-btn danger" @click="removeModel(type, index)" title="删除">
-                  <Trash2 :size="12" />
-                </button>
-              </div>
-            </div>
+        <!-- 必填警告 -->
+        <div v-if="showRequiredWarning" class="warning-bar">
+          ⚠ chat / embedding / rerank 为知识库必填，请确保已配置
+        </div>
 
-            <div class="form-row">
-              <div class="form-group">
-                <label class="form-label">// PROVIDER</label>
-                <select
-                  v-model="model.provider"
-                  class="form-select"
-                  @change="onProviderChange(model)"
-                >
-                  <option value="openai">OpenAI</option>
-                  <option value="claude">Claude</option>
-                  <option value="ollama">Ollama</option>
-                  <option value="deepseek">DeepSeek</option>
-                  <option value="custom">Custom</option>
-                </select>
-              </div>
-              <div class="form-group">
-                <label class="form-label">// MODEL</label>
-                <input v-model="model.model" type="text" class="form-input" placeholder="gpt-4o" />
-              </div>
-            </div>
-
-            <div class="form-group">
-              <label class="form-label">// BASE URL</label>
-              <input
-                v-model="model.base_url"
-                type="text"
-                class="form-input"
-                :placeholder="getDefaultBaseUrl(model.provider)"
+        <!-- Chat Section -->
+        <div class="llm-type-section">
+          <div class="llm-type-header">
+            <span class="llm-type-title">CHAT</span>
+            <button class="add-btn" @click="addModel('chat')">
+              <Plus :size="12" /> 添加
+            </button>
+          </div>
+          <div v-if="llmConfig.chat && llmConfig.chat.length > 0" class="model-table">
+            <div v-for="(model, index) in llmConfig.chat" :key="index">
+              <LLMTableRow
+                :model="model"
+                :is-expanded="expandedRow === getRowKey('chat', index)"
+                @toggle="toggleRow('chat', index, model)"
+                @update="(m) => updateModel('chat', index, m)"
+                @delete="removeModel('chat', index)"
+                @test="(m) => testModel('chat', index, m)"
               />
             </div>
+          </div>
+          <div v-else class="empty-state">暂无 chat 模型配置</div>
+        </div>
 
-            <div class="form-group">
-              <label class="form-label">// API KEY</label>
-              <div class="input-with-toggle">
-                <input
-                  v-model="model.api_key"
-                  :type="showApiKey[`${type}-${index}`] ? 'text' : 'password'"
-                  class="form-input"
-                  placeholder="sk-..."
-                />
-                <button class="toggle-visibility" @click="showApiKey[`${type}-${index}`] = !showApiKey[`${type}-${index}`]">
-                  <Eye v-if="!showApiKey[`${type}-${index}`]" :size="14" />
-                  <EyeOff v-else :size="14" />
-                </button>
-              </div>
-            </div>
-
-            <div class="model-footer">
-              <button class="test-btn" @click="testLLM(type, model)">
-                <Play :size="12" /> 测试连接
-              </button>
+        <!-- VLM Section -->
+        <div class="llm-type-section">
+          <div class="llm-type-header">
+            <span class="llm-type-title">VLM <span class="optional-tag">(可选)</span></span>
+            <button class="add-btn" @click="addModel('vlm')">
+              <Plus :size="12" /> 添加
+            </button>
+          </div>
+          <div v-if="llmConfig.vlm && llmConfig.vlm.length > 0" class="model-table">
+            <div v-for="(model, index) in llmConfig.vlm" :key="index">
+              <LLMTableRow
+                :model="model"
+                :is-expanded="expandedRow === getRowKey('vlm', index)"
+                @toggle="toggleRow('vlm', index, model)"
+                @update="(m) => updateModel('vlm', index, m)"
+                @delete="removeModel('vlm', index)"
+                @test="(m) => testModel('vlm', index, m)"
+              />
             </div>
           </div>
+          <div v-else class="empty-state">暂无 vlm 模型配置</div>
         </div>
 
-        <!-- 空状态 -->
-        <div v-else class="empty-state">
-          <span>暂无模型配置</span>
-          <button class="add-btn" @click="addModel(type)">
-            <Plus :size="12" /> 添加第一个模型
-          </button>
+        <!-- Embedding Section -->
+        <div class="llm-type-section">
+          <div class="llm-type-header">
+            <span class="llm-type-title">EMBEDDING <span class="required-tag">(知识库)</span></span>
+            <button class="add-btn" @click="addModel('embedding')">
+              <Plus :size="12" /> 添加
+            </button>
+          </div>
+          <div v-if="llmConfig.embedding && llmConfig.embedding.length > 0" class="model-table">
+            <div v-for="(model, index) in llmConfig.embedding" :key="index">
+              <LLMTableRow
+                :model="model"
+                :is-expanded="expandedRow === getRowKey('embedding', index)"
+                @toggle="toggleRow('embedding', index, model)"
+                @update="(m) => updateModel('embedding', index, m)"
+                @delete="removeModel('embedding', index)"
+                @test="(m) => testModel('embedding', index, m)"
+              />
+            </div>
+          </div>
+          <div v-else class="empty-state">暂无 embedding 模型配置</div>
+        </div>
+
+        <!-- Rerank Section -->
+        <div class="llm-type-section">
+          <div class="llm-type-header">
+            <span class="llm-type-title">RERANK <span class="required-tag">(知识库)</span></span>
+            <button class="add-btn" @click="addModel('rerank')">
+              <Plus :size="12" /> 添加
+            </button>
+          </div>
+          <div v-if="llmConfig.rerank && llmConfig.rerank.length > 0" class="model-table">
+            <div v-for="(model, index) in llmConfig.rerank" :key="index">
+              <LLMTableRow
+                :model="model"
+                :is-expanded="expandedRow === getRowKey('rerank', index)"
+                @toggle="toggleRow('rerank', index, model)"
+                @update="(m) => updateModel('rerank', index, m)"
+                @delete="removeModel('rerank', index)"
+                @test="(m) => testModel('rerank', index, m)"
+              />
+            </div>
+          </div>
+          <div v-else class="empty-state">暂无 rerank 模型配置</div>
         </div>
       </div>
 
-      <button
-        class="save-btn full-width"
-        @click="saveLLM"
-        :disabled="saving || !isLlmDirty"
-      >
-        <div v-if="saving" class="btn-loader"></div>
-        <Save v-else :size="14" />
-        <span>{{ saving ? 'SAVING...' : 'SAVE LLM CONFIG' }}</span>
-      </button>
-
       <!-- Scheduler Section -->
       <div class="settings-card">
         <div class="card-header">
@@ -857,6 +882,54 @@ onMounted(loadSettings)
   border-top: 1px solid var(--border-dim);
 }
 
+/* LLM Type Section */
+.llm-type-section {
+  margin-bottom: 20px;
+}
+
+.llm-type-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 10px;
+}
+
+.llm-type-title {
+  font-family: var(--font-display);
+  font-size: 11px;
+  letter-spacing: 0.15em;
+  color: var(--accent-cyan);
+}
+
+.optional-tag {
+  font-size: 9px;
+  color: var(--text-dim);
+  letter-spacing: 0.1em;
+}
+
+.required-tag {
+  font-size: 9px;
+  color: var(--accent-red);
+  letter-spacing: 0.1em;
+}
+
+/* Warning Bar */
+.warning-bar {
+  padding: 10px 14px;
+  background: rgba(239, 68, 68, 0.1);
+  border: 1px solid rgba(239, 68, 68, 0.3);
+  border-radius: var(--radius-sm);
+  color: var(--accent-red);
+  font-family: var(--font-mono);
+  font-size: 11px;
+  margin-bottom: 16px;
+}
+
+/* Model Table */
+.model-table {
+  /* 表格容器 */
+}
+
 /* Empty State */
 .empty-state {
   display: flex;