feat: newapi-dashboard 全栈项目初始化

为 new-api (LLM API 网关) 构建独立前端管理面板:
- React 18 + TypeScript + Vite + Ant Design 5 前端
- Node.js + Express + better-sqlite3 BFF 后端
- 登录页: 站点选择器 + UserID + AccessToken 认证
- 仪表盘: 用户信息、额度环形图、7天趋势图、模型饼图、令牌概览、日志时间线
- 账单页: 筛选日志表格、模型消耗柱状图、充值记录、CSV/PDF 导出(HMAC签名)
- 管理员站点管理: 站点 CRUD
- API 代理: 多站点切换，会话管理

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

src/store/authStore.ts

@@ -0,0 +1,52 @@
+import { create } from 'zustand'
+
+interface UserInfo {
+  id: number
+  username: string
+  display_name: string
+  role: number
+  status: number
+  email: string
+  group: string
+  quota: number
+  used_quota: number
+  request_count: number
+  aff_code: string
+  inviter_id: number
+}
+
+interface SiteInfo {
+  id: number
+  name: string
+  url: string
+}
+
+interface AuthState {
+  sessionToken: string | null
+  userInfo: UserInfo | null
+  site: SiteInfo | null
+  isLoggedIn: boolean
+  loading: boolean
+  login: (sessionToken: string, userInfo: UserInfo, site: SiteInfo) => void
+  logout: () => void
+  updateUserInfo: (userInfo: UserInfo) => void
+  setLoading: (loading: boolean) => void
+}
+
+export const useAuthStore = create<AuthState>((set) => ({
+  sessionToken: localStorage.getItem('sessionToken'),
+  userInfo: null,
+  site: null,
+  isLoggedIn: !!localStorage.getItem('sessionToken'),
+  loading: true,
+  login: (sessionToken, userInfo, site) => {
+    localStorage.setItem('sessionToken', sessionToken)
+    set({ sessionToken, userInfo, site, isLoggedIn: true, loading: false })
+  },
+  logout: () => {
+    localStorage.removeItem('sessionToken')
+    set({ sessionToken: null, userInfo: null, site: null, isLoggedIn: false, loading: false })
+  },
+  updateUserInfo: (userInfo) => set({ userInfo }),
+  setLoading: (loading) => set({ loading }),
+}))