Complete Phase 7: Polish & Cross-Cutting Concerns

This commit implements all remaining polish tasks (T193-T210) to make
the application production-ready.

## Logging & Monitoring (T193, T194, T208, T209)
- Add structured JSON logging for production environments
- Add human-readable logging for development
- Implement comprehensive error logging across all routes:
  * submission.py: product access, validation, success/failure
  * auth.py: login attempts, successes, failures, logouts
  * dashboard.py: access and errors
- Add /health endpoint for monitoring (checks data dir, API key)
- Add environment variable validation on startup

## Security Hardening (T196-T199, T207)
- Add HSTS headers in production (1 year, includeSubDomains)
- Add security headers: X-Content-Type-Options, X-Frame-Options, X-XSS-Protection
- Verify CSRF protection on all POST routes (Flask-WTF)
- Verify session cookie security flags (HttpOnly, Secure, SameSite)
- Verify XSS prevention (Jinja2 auto-escaping)
- Verify no hardcoded secrets (only in test files)

## Documentation (T195, T203, T210)
- Add comprehensive README.md with:
  * Features, quick start, project structure
  * Usage guides (end users, product owners, admins)
  * Configuration, testing, deployment instructions
- Add detailed docs/deployment.md with:
  * Production deployment steps
  * ClamAV, Nginx, SSL/TLS setup
  * Security hardening, monitoring, backup strategies
- Add requirements-dev.txt for development dependencies

## Performance Testing (T200, T201)
- Add test_performance.py with 4 comprehensive tests:
  * 100 concurrent submissions (SC-012)
  * Dashboard load <3s for 1000 items (SC-008)
  * Large file upload handling
  * Rate limiting verification
- Add performance marker to pytest.ini

## Testing
- All 49 tests passing, 1 skipped
- Fixed error handling to preserve HTTP status codes

Phase 7 complete. Application is production-ready with comprehensive
logging, security, monitoring, and documentation.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

app/routes/dashboard.py

@@ -60,52 +60,59 @@ def list():
         language: Filter by language
         search: Search query
     """
-    # Get query parameters
-    page = request.args.get('page', 1, type=int)
-    category = request.args.get('category')
-    status = request.args.get('status')
-    language = request.args.get('language')
-    search_query = request.args.get('search')
+    try:
+        # Get query parameters
+        page = request.args.get('page', 1, type=int)
+        category = request.args.get('category')
+        status = request.args.get('status')
+        language = request.args.get('language')
+        search_query = request.args.get('search')
 
-    # Build filters
-    filters = {}
-    if category:
-        filters['category'] = category
-    if status:
-        filters['status'] = status
-    if language:
-        filters['language'] = language
+        # Build filters
+        filters = {}
+        if category:
+            filters['category'] = category
+        if status:
+            filters['status'] = status
+        if language:
+            filters['language'] = language
 
-    # Get product IDs for current user
-    product_ids = get_user_product_ids()
+        # Get product IDs for current user
+        product_ids = get_user_product_ids()
 
-    # Load feedback list
-    result = FeedbackStorageService.load_feedback_list(
-        product_ids=product_ids,
-        page=page,
-        per_page=50,
-        filters=filters if filters else None,
-        search_query=search_query
-    )
+        current_app.logger.info(f'Dashboard accessed by {current_user.username} (page={page}, filters={filters})')
 
-    # Load product names for display
-    all_products = Product.get_all()
-    product_names = {p.product_id: p.name for p in all_products}
+        # Load feedback list
+        result = FeedbackStorageService.load_feedback_list(
+            product_ids=product_ids,
+            page=page,
+            per_page=50,
+            filters=filters if filters else None,
+            search_query=search_query
+        )
 
-    return render_template(
-        'dashboard/list.html',
-        feedback_list=result['items'],
-        page=result['page'],
-        pages=result['pages'],
-        total=result['total'],
-        product_names=product_names,
-        filters={
-            'category': category,
-            'status': status,
-            'language': language,
-            'search': search_query
-        }
-    )
+        # Load product names for display
+        all_products = Product.get_all()
+        product_names = {p.product_id: p.name for p in all_products}
+
+        return render_template(
+            'dashboard/list.html',
+            feedback_list=result['items'],
+            page=result['page'],
+            pages=result['pages'],
+            total=result['total'],
+            product_names=product_names,
+            filters={
+                'category': category,
+                'status': status,
+                'language': language,
+                'search': search_query
+            }
+        )
+
+    except Exception as e:
+        current_app.logger.error(f'Error loading dashboard for {current_user.username}: {e}', exc_info=True)
+        abort(500)
 
 
 @bp.route('/feedback/<feedback_id>')