fix(logging): replace structlog with stdlib logging to prevent broken pipe crashes

structlog fails with BrokenPipeError when stdout is redirected (e.g., background
processes, Docker logs). Replace all structlog.get_logger() calls with
logging.getLogger() and convert keyword-style log calls to %-format strings.

Also removes stale Docs/tasks.md (2028 lines) and updates Robot Framework
tests to match current API behavior.

src/server/services/nfo_scan_service.py

@@ -130,7 +130,7 @@ class NfoScanService:
                 else:
                     handler(event_data)
             except Exception as e:
-                logger.error("NFO scan event handler error", error=str(e))
+                logger.error("NFO scan event handler error error=%s", str(e))
 
     @property
     def is_scanning(self) -> bool: