fix: suppress Uvicorn WebSocket rejection noise in logs

Unknown-path WS probes (e.g. /waapi) generate three INFO lines from
uvicorn.access + uvicorn.error on every attempt. Install a logging.Filter
on both loggers at startup to drop:
  - access log entries:  "WebSocket <path>" 403
  - error log entries:   "connection rejected ..." / "connection closed"

These are handled gracefully by _SPAStaticFiles; the logs add no value.

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

bot.py

@@ -40,6 +40,26 @@ except Exception:
 logging.basicConfig(level=logging.INFO)
 logger = logging.getLogger(__name__)
 
+
+class _UvicornWSNoiseFilter(logging.Filter):
+    """Suppress per-connection WebSocket rejection noise from Uvicorn.
+
+    When an unknown path (e.g. /waapi probes) hits the server as a WebSocket
+    upgrade, Uvicorn logs three lines at INFO:
+      - uvicorn.access:  '... "WebSocket /waapi" 403'
+      - uvicorn.error:   'connection rejected (403 Forbidden)'
+      - uvicorn.error:   'connection closed'
+    These are expected and handled gracefully; we just don't want them filling
+    the log.
+    """
+    def filter(self, record: logging.LogRecord) -> bool:
+        msg = record.getMessage()
+        if '"WebSocket ' in msg and ' 403' in msg:
+            return False
+        if msg.startswith("connection rejected") or msg == "connection closed":
+            return False
+        return True
+
 _PROJECT_ROOT = Path(__file__).resolve().parent
 
 
@@ -192,6 +212,11 @@ async def main() -> None:
                 loop="none",  # use existing event loop
             )
             uvi_server = uvicorn.Server(uvi_config)
+
+            _ws_filter = _UvicornWSNoiseFilter()
+            logging.getLogger("uvicorn.access").addFilter(_ws_filter)
+            logging.getLogger("uvicorn.error").addFilter(_ws_filter)
+
             coroutines.append(uvi_server.serve())
             logger.info(
                 "Web UI enabled at http://%s:%d", config.web_host, config.web_port