fix(ocr): increase to 8g mem_limit and larger batch sizes

5GB free on host while OCR runs — give the container more room.
Bump batch sizes (detector=2, recognition=4) so it processes
faster with the available memory.

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

docker-compose.yml

@@ -78,7 +78,7 @@ services:
       dockerfile: Dockerfile
     container_name: archive-ocr
     restart: unless-stopped
-    mem_limit: 4g
+    mem_limit: 8g
     memswap_limit: 8g
     volumes:
       - ocr_models:/app/models
@@ -86,8 +86,8 @@ services:
       KRAKEN_MODEL_PATH: /app/models/german_kurrent.mlmodel
       OCR_CONFIDENCE_THRESHOLD: "0.3"
       OCR_CONFIDENCE_THRESHOLD_KURRENT: "0.5"
-      RECOGNITION_BATCH_SIZE: "1"
+      RECOGNITION_BATCH_SIZE: "4"
-      DETECTOR_BATCH_SIZE: "1"
+      DETECTOR_BATCH_SIZE: "2"
     networks:
       - archive-net
     healthcheck: