feat: add admin user system with role-based access control

Implement comprehensive admin user system for Kubernetes deployment:

Backend:
- Add isAdmin field to User model for role-based permissions
- Create adminAuth middleware to protect admin-only routes
- Protect 11 routes across rewards, cache, streets, and analytics endpoints
- Update setup-couchdb.js to seed default admin user at deployment

Kubernetes:
- Add ADMIN_EMAIL and ADMIN_PASSWORD to secrets.yaml
- Add ADMIN_EMAIL to configmap.yaml for non-sensitive config
- Create couchdb-init-job.yaml for automated database initialization
- Update secrets.yaml.example with admin user documentation

Frontend:
- Create AdminRoute component for admin-only page protection
- Create comprehensive AdminDashboard with 5 tabs:
  * Overview: Platform statistics and quick actions
  * Users: List, search, manage admin status, delete users
  * Streets: Create, edit, delete streets
  * Rewards: Create, edit, toggle, delete rewards
  * Content: Moderate posts and events
- Add Admin navigation link in Navbar (visible only to admins)
- Integrate admin routes in App.js

Default admin user:
- Email: will@wills-portal.com
- Created automatically by K8s init job at deployment

Routes protected:
- POST/PUT/DELETE /api/rewards (catalog management)
- POST /api/streets (street creation)
- DELETE /api/cache (cache operations)
- GET /api/analytics/* (platform statistics)

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

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

scripts/setup-couchdb.js

@@ -367,14 +367,87 @@ class CouchDBSetup {
     }
   }
 
-  async run() {
-    try {
-      await this.initialize();
-      await this.createDatabase();
-      await this.createIndexes();
-      await this.createSecurityDocument();
-      await this.seedBadges();
-      await this.verifySetup();
+   async seedAdminUser() {
+     console.log('👤 Seeding admin user...');
+     
+     const ADMIN_EMAIL = process.env.ADMIN_EMAIL;
+     const ADMIN_PASSWORD = process.env.ADMIN_PASSWORD;
+     
+     if (!ADMIN_EMAIL || !ADMIN_PASSWORD) {
+       console.log('⚠️  ADMIN_EMAIL or ADMIN_PASSWORD not set, skipping admin user creation');
+       return;
+     }
+     
+     const db = this.nano.use(COUCHDB_DB_NAME);
+     
+     // Check if admin user already exists
+     try {
+       const existing = await db.find({
+         selector: { type: 'user', email: ADMIN_EMAIL },
+         limit: 1
+       });
+       
+       if (existing.docs.length > 0) {
+         const user = existing.docs[0];
+         if (!user.isAdmin) {
+           user.isAdmin = true;
+           user.updatedAt = new Date().toISOString();
+           await db.insert(user);
+           console.log('✅ Existing user promoted to admin');
+         } else {
+           console.log('ℹ️  Admin user already exists');
+         }
+         return;
+       }
+     } catch (error) {
+       // Continue with creation
+     }
+     
+     // Create new admin user with hashed password
+     const bcrypt = require('bcryptjs');
+     const salt = await bcrypt.genSalt(10);
+     const hashedPassword = await bcrypt.hash(ADMIN_PASSWORD, salt);
+     
+     const adminUser = {
+       _id: `user_admin_${Date.now()}`,
+       type: 'user',
+       name: 'Administrator',
+       email: ADMIN_EMAIL,
+       password: hashedPassword,
+       isAdmin: true,
+       isPremium: true,
+       points: 0,
+       avatar: null,
+       profilePicture: null,
+       bio: 'System Administrator',
+       location: '',
+       website: '',
+       social: { twitter: '', github: '', linkedin: '' },
+       privacySettings: { profileVisibility: 'private' },
+       preferences: { emailNotifications: true, pushNotifications: true, theme: 'light' },
+       adoptedStreets: [],
+       completedTasks: [],
+       posts: [],
+       events: [],
+       earnedBadges: [],
+       stats: { streetsAdopted: 0, tasksCompleted: 0, postsCreated: 0, eventsParticipated: 0, badgesEarned: 0 },
+       createdAt: new Date().toISOString(),
+       updatedAt: new Date().toISOString()
+     };
+     
+     await db.insert(adminUser);
+     console.log(`✅ Admin user created: ${ADMIN_EMAIL}`);
+   }
+
+   async run() {
+     try {
+       await this.initialize();
+       await this.createDatabase();
+       await this.createIndexes();
+       await this.createSecurityDocument();
+       await this.seedBadges();
+       await this.seedAdminUser();
+       await this.verifySetup();
       
       console.log('\n🎉 CouchDB setup completed successfully!');
       console.log(`\n📋 Connection Details:`);