fix: resolve messenger worker OOM by clearing EntityManager and disabling debug

Clear Doctrine identity map after each film import to prevent memory
accumulation. Run messenger with --no-debug and higher PHP memory_limit
to avoid profiling overhead in dev.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docker-compose.override.yaml

@@ -11,6 +11,11 @@ services:
     ports:
         - "${PORT_80:-80}:80"
 
+  messenger:
+    command: ["php", "-d", "memory_limit=512M", "bin/console", "messenger:consume", "async", "--time-limit=3600", "--memory-limit=256M", "-vv", "--no-debug"]
+    volumes:
+      - .:/app
+
   database:
     ports:
       - "0.0.0.0:5432:5432"