Downgrade gradio to 3.50.2 and simplify launch args to avoid schema crash

app.py

@@ -713,6 +713,5 @@ if __name__ == "__main__":
         server_name="0.0.0.0",
         server_port=7860,
         show_error=True,
-        show_api=False,   # avoid json_schema parsing issues in Spaces
     )
 

requirements.txt

@@ -2,8 +2,8 @@ torch>=2.0.0
 torchvision>=0.15.0
 transformers>=4.30.0
 easyocr>=1.7.0
-# Downgrade Gradio to avoid json_schema bool issue on Spaces
-gradio==4.19.2
+# Further downgrade Gradio to avoid json_schema issues on Spaces
+gradio==3.50.2
 Pillow>=9.0.0
 numpy>=1.21.0
 scikit-learn>=1.0.0