fix(lint): use plain comments for architecture validator codes

Replace # noqa: SVC-006 with # SVC-006 to avoid ruff warnings about
unknown codes. Updated architecture validators to match the new format
by checking for the code string directly instead of the noqa: prefix.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

middleware/auth.py

@@ -502,6 +502,6 @@ class AuthManager:
             db.refresh(admin_user)
 
             # Log creation for audit trail (credentials redacted for security)
-            logger.info("Default admin user created")  # noqa: sec-001 sec-021
+            logger.info("Default admin user created")  # sec-001 sec-021
 
         return admin_user