feat(ocr): suppress uvicorn access logs for /metrics and /health

Adds a logging.Filter on uvicorn.access that drops records whose request
path is /metrics or /health. Each is hit on a tight schedule (Prometheus
scrape interval and Docker healthcheck), so unfiltered they dominate the
access log without carrying any information about real traffic.

Refs #652 (Nora's recommendation)

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

ocr-service/main.py

@@ -82,6 +82,23 @@ app = FastAPI(title="Familienarchiv OCR Service", lifespan=lifespan)
 Instrumentator(excluded_handlers=["/health", "/metrics"]).instrument(app).expose(app)
 
 
+class MetricsPathFilter(logging.Filter):
+    """Drop uvicorn.access entries for /metrics and /health to keep logs focused."""
+
+    _SUPPRESSED_PATHS = {"/metrics", "/health"}
+
+    def filter(self, record: logging.LogRecord) -> bool:
+        # uvicorn.access formats as: '%s - "%s %s HTTP/%s" %d'
+        if record.args and len(record.args) >= 3:
+            path = record.args[2]
+            if isinstance(path, str) and path in self._SUPPRESSED_PATHS:
+                return False
+        return True
+
+
+logging.getLogger("uvicorn.access").addFilter(MetricsPathFilter())
+
+
 @app.get("/health")
 def health():
     """Health endpoint — returns 200 only after models are loaded."""