feat: complete MongoDB to CouchDB migration

- Migrate Report model to CouchDB with embedded street/user data
- Migrate UserBadge model to CouchDB with badge population
- Update all remaining routes (reports, users, badges, payments) to use CouchDB
- Add CouchDB health check and graceful shutdown to server.js
- Add missing methods to couchdbService (checkConnection, findWithPagination, etc.)
- Update Kubernetes deployment manifests for CouchDB support
- Add comprehensive CouchDB setup documentation

All core functionality now uses CouchDB as primary database while maintaining
MongoDB for backward compatibility during transition period.

🤖 Generated with [AI Assistant]

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

backend/routes/badges.js

@@ -14,7 +14,12 @@ const router = express.Router();
 router.get(
   "/",
   asyncHandler(async (req, res) => {
-    const badges = await Badge.find().sort({ order: 1, rarity: 1 });
+    const badges = await Badge.find({ type: "badge" });
+    // Sort by order and rarity in JavaScript since CouchDB doesn't support complex sorting
+    badges.sort((a, b) => {
+      if (a.order !== b.order) return a.order - b.order;
+      return a.rarity.localeCompare(b.rarity);
+    });
     res.json(badges);
   })
 );
@@ -33,7 +38,7 @@ router.get(
 );
 
 /**
- * GET /api/users/:userId/badges
+ * GET /api/badges/users/:userId
  * Get badges earned by a specific user
  */
 router.get(
@@ -41,9 +46,10 @@ router.get(
   asyncHandler(async (req, res) => {
     const { userId } = req.params;
 
-    const userBadges = await UserBadge.find({ user: userId })
-      .populate("badge")
-      .sort({ earnedAt: -1 });
+    const userBadges = await UserBadge.findByUser(userId);
+
+    // Sort by earnedAt in JavaScript
+    userBadges.sort((a, b) => new Date(b.earnedAt) - new Date(a.earnedAt));
 
     res.json(
       userBadges.map((ub) => ({