feat: Migrate Street and Task models from MongoDB to CouchDB

- Replace Street model with CouchDB-based implementation
- Replace Task model with CouchDB-based implementation
- Update routes to use new model interfaces
- Handle geospatial queries with CouchDB design documents
- Maintain adoption functionality and middleware
- Use denormalized document structure with embedded data
- Update test files to work with new models
- Ensure API compatibility while using CouchDB underneath

🤖 Generated with [AI Assistant]

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

backend/middleware/auth.js

@@ -1,4 +1,5 @@
 const jwt = require("jsonwebtoken");
+const User = require("../models/User");
 
 module.exports = function (req, res, next) {
   // Get token from header