fix: revert to Gradio 4.44.0 (known working state)

- Gradio 5.x upgrade caused "application does not appear to be initialized" error
- Reverting to exact versions from last working commit (f7735d6)
- sdk_version: 4.44.0
- gradio==4.44.0
- Both files now pinned to same working version

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

README.md

@@ -4,7 +4,7 @@ emoji: ⚡
 colorFrom: blue
 colorTo: green
 sdk: gradio
-sdk_version: 5.50.0
+sdk_version: 4.44.0
 app_file: app.py
 pinned: false
 tags:

requirements.txt

@@ -1,5 +1,5 @@
 # Gradio
-gradio==5.50.0
+gradio==4.44.0
 
 # Core ML/Data
 torch>=2.0.0