feat: implement comprehensive gamification, analytics, and leaderboard system

This commit adds a complete gamification system with analytics dashboards,
leaderboards, and enhanced badge tracking functionality.

Backend Features:
- Analytics API with overview, user stats, activity trends, top contributors,
  and street statistics endpoints
- Leaderboard API supporting global, weekly, monthly, and friends views
- Profile API for viewing and managing user profiles
- Enhanced gamification service with badge progress tracking and user stats
- Comprehensive test coverage for analytics and leaderboard endpoints
- Profile validation middleware for secure profile updates

Frontend Features:
- Analytics dashboard with multiple tabs (Overview, Activity, Personal Stats)
- Interactive charts for activity trends and street statistics
- Leaderboard component with pagination and timeframe filtering
- Badge collection display with progress tracking
- Personal stats component showing user achievements
- Contributors list for top performing users
- Profile management components (View/Edit)
- Toast notifications integrated throughout
- Comprehensive test coverage for Leaderboard component

Enhancements:
- User model enhanced with stats tracking and badge management
- Fixed express.Router() capitalization bug in users route
- Badge service improvements for better criteria matching
- Removed unused imports in Profile component

This feature enables users to track their contributions, view community
analytics, compete on leaderboards, and earn badges for achievements.

🤖 Generated with OpenCode

Co-Authored-By: AI Assistant <noreply@opencode.ai>

backend/server.js

@@ -137,6 +137,7 @@ const aiRoutes = require("./routes/ai");
 const paymentRoutes = require("./routes/payments");
 const userRoutes = require("./routes/users");
 const cacheRoutes = require("./routes/cache");
+const profileRoutes = require("./routes/profile");
 
 // Apply rate limiters
 app.use("/api/auth/register", authLimiter);
@@ -238,6 +239,8 @@ app.use("/api/ai", aiRoutes);
 app.use("/api/payments", paymentRoutes);
 app.use("/api/users", userRoutes);
 app.use("/api/cache", cacheRoutes);
+app.use("/api/analytics", analyticsRoutes);
+app.use("/api/leaderboard", leaderboardRoutes);
 
 app.get("/", (req, res) => {
   res.send("Street Adoption App Backend");