fix: change default OCR language from English to Swedish

Project targets Swedish invoice extraction. PaddleOCR sv model provides
better recognition of Swedish-specific characters (å, ä, ö).

packages/shared/shared/ocr/paddle_ocr.py

@@ -58,7 +58,7 @@ class OCREngine:
 
     def __init__(
         self,
-        lang: str = "en",
+        lang: str = "sv",
         det_model_dir: str | None = None,
         rec_model_dir: str | None = None,
         use_doc_orientation_classify: bool = True,
@@ -387,7 +387,7 @@ class OCREngine:
 
 def extract_ocr_tokens(
     image_path: str | Path,
-    lang: str = "en",
+    lang: str = "sv",
     page_no: int = 0
 ) -> list[OCRToken]:
     """