fix: add libgomp1 (OpenMP) + remove unused lang parameter

PaddlePaddle braucht libgomp.so.1 fuer Inferenz.
lang wird ignoriert bei explizitem model_name.

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

paddleocr-service/main.py

@@ -25,7 +25,6 @@ def get_engine():
 
         logger.info("Loading PaddleOCR model (first time may download)...")
         _engine = PaddleOCR(
-            lang="en",
             text_recognition_model_name="latin_PP-OCRv5_mobile_rec",
             use_doc_orientation_classify=False,
             use_doc_unwarping=False,