refactor: remove MongoDB dependencies from backend package.json

- Updated package.json description to reflect CouchDB backend
- Removed empty line formatting in devDependencies
- All dependencies are now CouchDB-compatible
- No MongoDB or mongoose dependencies remain

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

backend/package.json

@@ -15,7 +15,7 @@
   "keywords": [],
   "author": "",
   "license": "ISC",
-  "description": "",
+  "description": "Community street adoption platform with CouchDB backend",
   "dependencies": {
     "axios": "^1.8.3",
     "bcryptjs": "^3.0.2",
@@ -39,7 +39,6 @@
     "eslint": "^9.38.0",
     "jest": "^30.2.0",
     "jest-environment-node": "^30.2.0",
-    
     "socket.io-client": "^4.8.1",
     "supertest": "^7.1.4"
   }