update docs.

docs/design/authentication-system.md

@@ -47,14 +47,14 @@ graph TB
 The authentication blueprint handles all authentication-related routes and logic:
 
 #### Routes
-- `/login`: GET/POST - User login page and authentication
-- `/signup`: GET/POST - User registration page and account creation
-- `/logout`: GET - User logout and session termination
+- `/auth/login`: GET/POST - User login page and authentication
+- `/auth/signup`: GET/POST - User registration page and account creation
+- `/auth/logout`: GET - User logout and session termination
 
 #### Key Functions
-- `login()`: Handles user authentication
-- `signup()`: Manages user registration
-- `logout()`: Terminates user sessions
+- `login()`: Handles user authentication with form validation
+- `signup()`: Manages user registration with server-side validation
+- `logout()`: Terminates user sessions and clears authentication state
 - `validate_password()`: Enforces password complexity requirements
 
 ### 2. User Model ([`app/models.py`](app/models.py:13))
@@ -288,6 +288,15 @@ login_manager.login_message = 'Please log in to access this page.'
 
 ### Blueprint Registration
 
+The auth blueprint is registered with URL prefix `/auth/`:
+
+```python
+from app.auth import auth
+app.register_blueprint(auth, url_prefix='/auth')
+```
+
+## Testing Strategy
+
 ### Unit Tests
 
 #### Authentication Tests
@@ -350,4 +359,11 @@ login_manager.login_message_category = 'warning'
 - Suspicious activity monitoring
 - IP-based security checks
 
-- IP-based security checks
+### 6. Current Implementation Status
+- User authentication with session management fully implemented
+- Password complexity validation operational
+- Server-side form validation complete
+- Error handling with user-friendly messages
+- Blueprint-based routing with proper URL prefixes
+- Error handling with user-friendly messages
+- Blueprint-based routing with proper URL prefixes