chore: add /mcp/health filter and configure uvicorn.access logging

Add /mcp/health to suppress paths in log_filters.py to demote health
probe logs to DEBUG level. Configure uvicorn.access logger in settings.py
to manage access logs directly instead of relying on mcp_server internal
filters. Update comments to reflect that uvicorn access is now managed
in project settings.

mnemosyne/mnemosyne/log_filters.py

@@ -20,6 +20,7 @@ _SUPPRESS_PATHS = frozenset(
         "/ready",
         "/healthz",
         "/metrics",
+        "/mcp/health",
     }
 )
 

mnemosyne/mnemosyne/settings.py

@@ -389,8 +389,7 @@ LOGGING = {
     "filters": {
         # Demotes successful health-probe access log lines from INFO to
         # DEBUG so production INFO output stays signal-only.  Applied to
-        # django.server and gunicorn.access; uvicorn does its own thing
+        # django.server, gunicorn.access, and uvicorn.access.
-        # via the structlog-style filter in mcp_server.
         "suppress_health_access": {
             "()": "mnemosyne.log_filters.SuppressHealthAccessFilter",
         },
@@ -458,6 +457,11 @@ LOGGING = {
             "level": DJANGO_LOGGING_LEVEL,
             "propagate": False,
         },
+        "uvicorn.access": {
+            "handlers": ["access"],
+            "level": LOGGING_LEVEL,
+            "propagate": False,
+        },
         # Noisy library internals — pin to WARNING regardless of root level
         # so we don't drown in HTTP-client debug spam when LOGGING_LEVEL=DEBUG.
         "httpx": {"handlers": ["console"], "level": "WARNING", "propagate": False},