feat: initial project setup with frontend mockup

- Docker Compose setup with nginx reverse proxy and frontend service
- React + Vite + Tailwind CSS configuration
- Complete mockup of all application views:
  - Authentication (login/register)
  - Events list and selection
  - Event chat with matchmaking
  - 1:1 private chat with WebRTC P2P video transfer mockup
  - Partner rating system
  - Collaboration history
- Mock data for users, events, messages, matches, and ratings
- All UI text and messages in English
- Project documentation (CONTEXT.md, TODO.md, README.md, QUICKSTART.md)

frontend/src/contexts/AuthContext.jsx

@@ -0,0 +1,70 @@
+import { createContext, useContext, useState, useEffect } from 'react';
+import { mockCurrentUser } from '../mocks/users';
+
+const AuthContext = createContext(null);
+
+export const useAuth = () => {
+  const context = useContext(AuthContext);
+  if (!context) {
+    throw new Error('useAuth must be used within AuthProvider');
+  }
+  return context;
+};
+
+export const AuthProvider = ({ children }) => {
+  const [user, setUser] = useState(null);
+  const [loading, setLoading] = useState(true);
+
+  useEffect(() => {
+    // Check if user is logged in (from localStorage)
+    const storedUser = localStorage.getItem('user');
+    if (storedUser) {
+      setUser(JSON.parse(storedUser));
+    }
+    setLoading(false);
+  }, []);
+
+  const login = async (email, password) => {
+    // Mock login - w przyszłości będzie API call
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        const userData = mockCurrentUser;
+        setUser(userData);
+        localStorage.setItem('user', JSON.stringify(userData));
+        resolve(userData);
+      }, 500);
+    });
+  };
+
+  const register = async (username, email, password) => {
+    // Mock register - w przyszłości będzie API call
+    return new Promise((resolve) => {
+      setTimeout(() => {
+        const userData = {
+          ...mockCurrentUser,
+          username,
+          email,
+        };
+        setUser(userData);
+        localStorage.setItem('user', JSON.stringify(userData));
+        resolve(userData);
+      }, 500);
+    });
+  };
+
+  const logout = () => {
+    setUser(null);
+    localStorage.removeItem('user');
+  };
+
+  const value = {
+    user,
+    loading,
+    login,
+    register,
+    logout,
+    isAuthenticated: !!user,
+  };
+
+  return <AuthContext.Provider value={value}>{children}</AuthContext.Provider>;
+};