Phase C3: Site Settings Refactoring with horizontal sub-tabs and Logo upload

- Replaced vertical card layout with 5 horizontal tabs: 基础设置/Logo设置/邮件配置/短信配置/注册设置
- Added Logo upload tab with drag-drop preview and file upload
- Added Registration Settings tab (allow_register, email/phone verify, default role, welcome message)
- Added logo upload backend endpoint (POST /admin/settings/logo/upload)
- Added modal sub-component CSS classes for dark theme
- Fixed all hardcoded white backgrounds for dark theme
- Added uploadLogo method to adminAPI

frontend/src/api/index.ts

@@ -277,6 +277,7 @@ export const adminAPI = {
   getStats: () => get<any>('/admin/dashboard/stats'),
   getRecentLogs: () => get<any[]>('/admin/dashboard/recent-logs'),
   getRecentAudit: () => get<any[]>('/admin/dashboard/recent-audit'),
+    getDailyStats: (days?: number) => get<{ days: number; data: Array<{ date: string; tokens: number }> }>(`/admin/dashboard/daily-stats${days ? `?days=${days}` : ''}`),
   // 用户管理
   getUsers: (params?: any) => {
     const sp = new URLSearchParams();
@@ -588,8 +589,16 @@ export const adminAPI = {
   getAIAppTemplates: () => get<any>('/admin/apps/templates'),
   createAIAppTemplate: (data: any) => post<any>('/admin/apps/templates', data),
   createAIAppFromTemplate: (templateId: string, data: any) => post<any>('/admin/apps/apps/from-template/' + templateId, data),
-  getAIAppCategories: () => get<any>('/admin/apps/categories')
-
+  getAIAppCategories: () => get<any>('/admin/apps/categories'),
+  // Logo 上传
+  uploadLogo: (formData: FormData) => {
+    const token = localStorage.getItem('access_token');
+    return fetch(`/app/api/admin/settings/logo/upload`, {
+      method: 'POST',
+      headers: { 'Authorization': `Bearer ${token}` },
+      body: formData,
+    }).then(res => res.json());
+  },
 
 
 };
@@ -662,4 +671,5 @@ export const evolutionAPI = {
     return get<import('@/types').EvolutionReport[]>(`/evolution/reports${qs}`);
   },
   getReportDetail: (reportId: string) => get<import('@/types').EvolutionReport>(`/evolution/reports/${reportId}`),
+
 };