fix: downgrade sdk_version to gradio 4.44.1 for HF Spaces

HF Spaces forces gradio install based on sdk_version in README.
Gradio 5.6.0 has a bug in gradio_client json_schema_to_python_type.
Also remove ssr_mode (gradio 5.x only option).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

README.md

@@ -5,7 +5,7 @@ emoji: 🎵
 colorFrom: blue
 colorTo: purple
 sdk: gradio
-sdk_version: "5.6.0"
+sdk_version: "4.44.1"
 python_version: "3.10"
 app_file: app.py
 pinned: false

app.py

@@ -642,5 +642,4 @@ if __name__ == "__main__":
         server_port=7860,
         show_api=False,
         show_error=True,
-        ssr_mode=False,
     )