refactor(logging): replace structlog with stdlib logging compat layer

- Remove structlog dependency from backend/pyproject.toml
- Add app.utils.logging_compat shim for keyword-arg logging API
- Add app.utils.json_formatter for JSON log output with extra fields
- Update all backend modules to use logging_compat.get_logger()
- Update docstrings in log_sanitizer.py and json_formatter.py
- Update test comment in test_async_utils.py
- Record 406 failing tests in Docs/Tasks.md for tracking

backend/app/services/blocklist_downloader.py

@@ -10,9 +10,9 @@ from __future__ import annotations
 import asyncio
 
 import aiohttp
-import structlog
+from app.utils.logging_compat import get_logger
 
-log: structlog.stdlib.BoundLogger = structlog.get_logger()
+log = get_logger(__name__)
 
 #: HTTP status codes that should be retried for blocklist downloads.
 _BLOCKLIST_HTTP_RETRY_STATUSES: frozenset[int] = frozenset({429, 500, 502, 503, 504})