fix: expose max wait time in sync endpoints (#164)

Signed-off-by: Michele Dolfi <dol@zurich.ibm.com>

docling_serve/settings.py

@@ -48,6 +48,8 @@ class DoclingServeSettings(BaseSettings):
     max_num_pages: int = sys.maxsize
     max_file_size: int = sys.maxsize
 
+    max_sync_wait: int = 120  # 2 minutes
+
     cors_origins: list[str] = ["*"]
     cors_methods: list[str] = ["*"]
     cors_headers: list[str] = ["*"]