fix(logging): resolve logging_compat keyword arg conflicts

- Fix logging_compat._log() to handle extra keyword arguments properly
- Update config.py, main.py, and test_bans.py for compatibility
- Update Tasks.md and runner.csx

backend/app/config.py

@@ -607,6 +607,7 @@ class Settings(BaseSettings):
         env_file=".env",
         env_file_encoding="utf-8",
         case_sensitive=False,
+        extra="ignore",
     )