Simplify setup_models.py - MMS auto-downloads on first use

Facebook MMS doesn't need pre-download:
- Will download (~200MB) on first Hindi synthesis request
- No TOS prompts (unlike XTTS)
- Auto-cached for subsequent requests
- Much simpler and cleaner

backend/setup_models.py

@@ -1,60 +1,23 @@
 #!/usr/bin/env python
-"""Download XTTS model on-demand (runs once on first deployment)."""
+"""Setup models on startup - Facebook MMS auto-downloads on first use."""
 
-import os
 import sys
 from pathlib import Path
 
 def setup_models():
-    """Ensure all required models are available."""
+    """Ensure models can be loaded (MMS will auto-download on first request)."""
     
     print("[Setup] Checking model requirements...")
     
-    # Ensure backend/models directory exists
+    # Ensure backend/models directory exists for caching
     models_dir = Path(__file__).parent.parent / "models"
     models_dir.mkdir(parents=True, exist_ok=True)
     
-    tts_model_dir = models_dir / "tts" / "tts_models--multilingual--multi-dataset--xtts_v2"
+    print("[Setup] ✓ Models directory ready")
+    print("[Setup] Hindi: Facebook MMS will download on first request (~200MB)")
+    print("[Setup] English: Local models loaded from backend/models/default/")
     
-    if tts_model_dir.exists() and (tts_model_dir / "model.pth").exists():
-        print(f"[Setup] ✓ XTTS model already present: {tts_model_dir}")
-        return True
-    
-    print("[Setup] Downloading XTTS-v2 model (1.8GB, first time only)...")
-    print("[Setup] This may take 5-10 minutes on first deployment...")
-    
-    try:
-        from TTS.api import TTS
-        import io
-        
-        os.environ['TTS_HOME'] = str(models_dir)
-        
-        # Suppress interactive prompts
-        old_stdin = sys.stdin
-        sys.stdin = io.StringIO("y\n")
-        
-        try:
-            tts = TTS(
-                model_name="tts_models/multilingual/multi-dataset/xtts_v2",
-                gpu=False
-            )
-            print("[Setup] ✓ XTTS model downloaded successfully")
-            
-            # Verify model exists
-            if (tts_model_dir / "model.pth").exists():
-                print(f"[Setup] ✓ Model verified at: {tts_model_dir}")
-                return True
-            else:
-                print(f"[Setup] ✗ Model not found at expected location: {tts_model_dir}")
-                return False
-                
-        finally:
-            sys.stdin = old_stdin
-            
-    except Exception as e:
-        print(f"[Setup] ✗ Failed to download XTTS model: {e}")
-        print("[Setup] Hindi synthesis will not be available")
-        return False
+    return True
 
 if __name__ == "__main__":
     success = setup_models()