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/routes/auth.js

@@ -16,8 +16,11 @@ router.get(
   "/",
   auth,
   asyncHandler(async (req, res) => {
-    const user = await User.findById(req.user.id).select("-password");
-    res.json(user);
+    const user = await User.findById(req.user.id);
+    if (!user) {
+      return res.status(404).json({ msg: "User not found" });
+    }
+    res.json(user.toSafeObject());
   }),
 );
 
@@ -33,20 +36,15 @@ router.post(
       return res.status(400).json({ success: false, msg: "User already exists" });
     }
 
-    user = new User({
+    user = await User.create({
       name,
       email,
       password,
     });
 
-    const salt = await bcrypt.genSalt(10);
-    user.password = await bcrypt.hash(password, salt);
-
-    await user.save();
-
     const payload = {
       user: {
-        id: user.id,
+        id: user._id,
       },
     };
 
@@ -78,14 +76,14 @@ router.post(
       return res.status(400).json({ success: false, msg: "Invalid credentials" });
     }
 
-    const isMatch = await bcrypt.compare(password, user.password);
+    const isMatch = await user.comparePassword(password);
     if (!isMatch) {
       return res.status(400).json({ success: false, msg: "Invalid credentials" });
     }
 
     const payload = {
       user: {
-        id: user.id,
+        id: user._id,
       },
     };