fix: increase paddleocr memory limit 4G → 6G

PaddlePaddle + PP-OCRv5 model + warmup OCR needs more than 4G on
CPU-only servers. Container was OOM-killed during warmup.

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

docker-compose.coolify.yml

@@ -162,7 +162,7 @@ services:
     deploy:
       resources:
         limits:
-          memory: 4G
+          memory: 6G
     healthcheck:
       test: ["CMD", "curl", "-f", "http://127.0.0.1:8095/health"]
       interval: 30s