feat: 实现基础设施层

axios 请求封装及七个业务模块 API，Pinia 状态管理（auth/system/models/tools），Mock 适配器与数据，以及流式对话、轮询、倒计时组合式函数。

frontend/src/stores/auth.ts

@@ -0,0 +1,45 @@
+import { defineStore } from 'pinia'
+import { ref, computed } from 'vue'
+import { login as loginApi } from '@/api/modules/system'
+import { SESSION_TIMEOUT } from '@/constants'
+
+/**
+ * 认证 store
+ * 沿用原项目 localStorage 的登录时间戳 + 5 分钟会话超时机制
+ */
+export const useAuthStore = defineStore('auth', () => {
+  const username = ref<string>(localStorage.getItem('username') || '')
+  const loginTime = ref<number>(parseInt(localStorage.getItem('loginTime') || '0', 10) || 0)
+
+  const isLoggedIn = computed(() => {
+    if (!loginTime.value) return false
+    return Date.now() - loginTime.value < SESSION_TIMEOUT
+  })
+
+  /** 登录 */
+  async function login(user: string, password: string) {
+    await loginApi(user, password)
+    username.value = user
+    loginTime.value = Date.now()
+    localStorage.setItem('username', user)
+    localStorage.setItem('loginTime', String(loginTime.value))
+  }
+
+  /** 续期会话（活跃时刷新） */
+  function refresh() {
+    if (isLoggedIn.value) {
+      loginTime.value = Date.now()
+      localStorage.setItem('loginTime', String(loginTime.value))
+    }
+  }
+
+  /** 退出 */
+  function logout() {
+    username.value = ''
+    loginTime.value = 0
+    localStorage.removeItem('username')
+    localStorage.removeItem('loginTime')
+  }
+
+  return { username, loginTime, isLoggedIn, login, refresh, logout }
+})

frontend/src/stores/models.ts

@@ -0,0 +1,34 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { getModelList } from '@/api/modules/model'
+import type { ModelItem } from '@/types'
+
+/**
+ * 模型列表缓存 store
+ * 列表页根据 base_model id 渲染模型名时使用
+ */
+export const useModelsStore = defineStore('models', () => {
+  const list = ref<ModelItem[]>([])
+  const loaded = ref(false)
+
+  async function load(force = false) {
+    if (loaded.value && !force) return
+    try {
+      list.value = (await getModelList()) || []
+      loaded.value = true
+    } catch {
+      list.value = []
+    }
+  }
+
+  /** 根据 id 获取模型名 */
+  function getModelName(modelId: string | number): string {
+    if (!modelId) return '-'
+    const model = list.value.find(
+      (m) => m.id == modelId || m.id === String(modelId) || m.id === Number(modelId),
+    )
+    return model ? model.name : `模型${modelId}`
+  }
+
+  return { list, loaded, load, getModelName }
+})

frontend/src/stores/system.ts

@@ -0,0 +1,36 @@
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import { getHealth } from '@/api/modules/system'
+import type { HealthMetrics } from '@/types'
+
+/**
+ * 顶部栏系统监控 store
+ * 30s 轮询 CPU/内存/磁盘使用率
+ */
+export const useSystemStore = defineStore('system', () => {
+  const metrics = ref<HealthMetrics>({})
+  let timer: ReturnType<typeof setInterval> | null = null
+
+  async function fetchMetrics() {
+    try {
+      metrics.value = await getHealth()
+    } catch {
+      // 静默失败，顶部栏非关键
+    }
+  }
+
+  function start() {
+    if (timer) return
+    fetchMetrics()
+    timer = setInterval(fetchMetrics, 30000)
+  }
+
+  function stop() {
+    if (timer) {
+      clearInterval(timer)
+      timer = null
+    }
+  }
+
+  return { metrics, fetchMetrics, start, stop }
+})

frontend/src/stores/tools.ts

@@ -0,0 +1,48 @@
+import { defineStore } from 'pinia'
+import { ref, watch } from 'vue'
+import type { CustomTool } from '@/types'
+
+/**
+ * 自定义工具 store（localStorage 持久化）
+ * 原 web 项目 customTools 仅存本地，无后端
+ */
+export const useToolsStore = defineStore('tools', () => {
+  const STORAGE_KEY = 'customTools'
+  const tools = ref<CustomTool[]>(loadFromStorage())
+
+  function loadFromStorage(): CustomTool[] {
+    try {
+      return JSON.parse(localStorage.getItem(STORAGE_KEY) || '[]')
+    } catch {
+      return []
+    }
+  }
+
+  // 持久化
+  watch(
+    tools,
+    (val) => {
+      localStorage.setItem(STORAGE_KEY, JSON.stringify(val))
+    },
+    { deep: true },
+  )
+
+  function addTool(tool: CustomTool) {
+    tools.value.push(tool)
+  }
+
+  function updateTool(id: string, data: Partial<CustomTool>) {
+    const idx = tools.value.findIndex((t) => t.id === id)
+    if (idx !== -1) tools.value[idx] = { ...tools.value[idx], ...data }
+  }
+
+  function removeTool(id: string) {
+    tools.value = tools.value.filter((t) => t.id !== id)
+  }
+
+  function getTool(id: string): CustomTool | undefined {
+    return tools.value.find((t) => t.id === id)
+  }
+
+  return { tools, addTool, updateTool, removeTool, getTool }
+})