fix(settings): auto-save after deleting a model

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

frontend/src/views/SettingsView.vue

@@ -112,7 +112,7 @@ function addModel(type: string) {
 }
 
 // 删除模型
-function removeModel(type: string, index: number) {
+async 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) {
@@ -122,6 +122,15 @@ function removeModel(type: string, index: number) {
   llmConfig.value[type as keyof LLMConfig]!.splice(index, 1)
   expandedRow.value = null
   editingSnapshot.value = null
+  // 自动保存到后端
+  try {
+    await settingsApi.updateLLM(llmConfig.value)
+    originalLlmConfig.value = JSON.parse(JSON.stringify(llmConfig.value))
+    showToast('删除成功')
+  } catch (e: unknown) {
+    const msg = (e as { response?: { data?: { detail?: string } } })?.response?.data?.detail || '删除失败'
+    showToast(msg, 'error')
+  }
 }
 
 // 行标识