Add comprehensive backend features and mobile UI improvements

Backend:
- Add 2FA authentication with TOTP support
- Add API keys management system
- Add audit logging for security events
- Add file upload/management system
- Add notifications system with preferences
- Add session management
- Add webhooks integration
- Add analytics endpoints
- Add export functionality
- Add password policy enforcement
- Add new database migrations for core tables

Frontend:
- Add module position system (top/bottom sidebar sections)
- Add search and notifications module configuration tabs
- Add mobile logo replacing hamburger menu
- Center page title absolutely when no tabs present
- Align sidebar footer toggles with navigation items
- Add lighter icon color in dark theme for mobile
- Add API keys management page
- Add notifications page with context
- Add admin analytics and audit logs pages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/types/index.ts

@@ -15,6 +15,7 @@ export interface User {
 export interface LoginRequest {
   username: string;
   password: string;
+  totp_code?: string;
 }
 
 export interface RegisterRequest {
@@ -42,14 +43,17 @@ export interface UserUpdatePayload {
 }
 
 export interface Token {
-  access_token: string;
+  access_token: string | null;
   token_type: string;
+  requires_2fa?: boolean;
+  temp_token?: string | null;
 }
 
 export interface AuthContextType {
   user: User | null;
   token: string | null;
-  login: (username: string, password: string) => Promise<void>;
+  login: (username: string, password: string) => Promise<{ requires_2fa: boolean; temp_token?: string | null }>;
+  verify2fa: (tempToken: string, code: string) => Promise<void>;
   register: (username: string, email: string, password: string) => Promise<void>;
   logout: () => void;
   isLoading: boolean;