fix: audioop shim in app.py for Python 3.13, remove gradio from requirements

app.py

@@ -17,6 +17,13 @@
 #               ultralytics   (for YOLOv8m-seg inference)
 # ─────────────────────────────────────────────────────────────────────────────
 
+# ── Python 3.13 audioop shim (removed from stdlib, needed by pydub/gradio) ───
+import sys, types
+if "audioop" not in sys.modules:
+    sys.modules["audioop"] = types.ModuleType("audioop")
+if "pyaudioop" not in sys.modules:
+    sys.modules["pyaudioop"] = types.ModuleType("pyaudioop")
+
 import os
 import sys
 import json

requirements.txt

@@ -9,5 +9,4 @@ huggingface_hub>=0.26.0
 opencv-python-headless==4.9.0.80
 scikit-image==0.25.2
 scipy==1.15.3
-matplotlib>=3.9.0
-gradio>=5.0.0
+matplotlib>=3.9.0