Add complete frontend implementation and Docker deployment setup

- Implement React frontend with TypeScript and Tailwind CSS
- Add scrappbook.de-inspired UI design with photo galleries
- Implement authentication, photo viewing, and download features
- Add Docker Swarm configuration with Traefik reverse proxy
- Set up Drone CI/CD pipeline for automated deployments
- Add monitoring stack with Prometheus and Grafana
- Create comprehensive deployment documentation
- Add simple local development setup with docker-compose.local.yml

Features:
- Password-protected galleries with expiration warnings
- Responsive photo grid with lightbox viewer
- Bulk download functionality
- Hot reload development environment
- Email testing with Mailhog
- Production-ready deployment scripts

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

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

frontend/src/contexts/AdminAuthContext.tsx

@@ -0,0 +1,81 @@
+import React, { createContext, useContext, useState, useEffect } from 'react';
+import type { ReactNode } from 'react';
+import { getAuthToken } from '../config/api';
+import { authService } from '../services';
+import type { AdminUser } from '../types';
+
+interface AdminAuthContextType {
+  isAuthenticated: boolean;
+  user: AdminUser | null;
+  login: (username: string, password: string) => Promise<void>;
+  logout: () => void;
+  isLoading: boolean;
+  error: string | null;
+}
+
+const AdminAuthContext = createContext<AdminAuthContextType | undefined>(undefined);
+
+export const useAdminAuth = () => {
+  const context = useContext(AdminAuthContext);
+  if (!context) {
+    throw new Error('useAdminAuth must be used within an AdminAuthProvider');
+  }
+  return context;
+};
+
+interface AdminAuthProviderProps {
+  children: ReactNode;
+}
+
+export const AdminAuthProvider: React.FC<AdminAuthProviderProps> = ({ children }) => {
+  const [isAuthenticated, setIsAuthenticated] = useState(false);
+  const [user, setUser] = useState<AdminUser | null>(null);
+  const [isLoading, setIsLoading] = useState(true);
+  const [error, setError] = useState<string | null>(null);
+
+  useEffect(() => {
+    // Check if user has a valid token on mount
+    const token = getAuthToken(true);
+    if (token) {
+      // TODO: Validate token with backend and get user info
+      setIsAuthenticated(true);
+    }
+    setIsLoading(false);
+  }, []);
+
+  const login = async (username: string, password: string) => {
+    try {
+      setError(null);
+      setIsLoading(true);
+      const response = await authService.adminLogin(username, password);
+      setUser(response.user);
+      setIsAuthenticated(true);
+    } catch (err: any) {
+      setError(err.response?.data?.error || 'Invalid credentials');
+      throw err;
+    } finally {
+      setIsLoading(false);
+    }
+  };
+
+  const logout = () => {
+    authService.adminLogout();
+    setIsAuthenticated(false);
+    setUser(null);
+  };
+
+  return (
+    <AdminAuthContext.Provider
+      value={{
+        isAuthenticated,
+        user,
+        login,
+        logout,
+        isLoading,
+        error,
+      }}
+    >
+      {children}
+    </AdminAuthContext.Provider>
+  );
+};