Initial implementation of AudioCraft Studio

Complete web interface for Meta's AudioCraft AI audio generation:

- Gradio UI with tabs for all 5 model families (MusicGen, AudioGen,
  MAGNeT, MusicGen Style, JASCO)
- REST API with FastAPI, OpenAPI docs, and API key auth
- VRAM management with ComfyUI coexistence support
- SQLite database for project/generation history
- Batch processing queue for async generation
- Docker deployment optimized for RunPod with RTX 4090

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

scripts/start.sh

@@ -0,0 +1,55 @@
+#!/bin/bash
+# Startup script for AudioCraft Studio
+# Used in Docker container and RunPod
+
+set -e
+
+echo "=========================================="
+echo "  AudioCraft Studio"
+echo "=========================================="
+
+# Create directories if they don't exist
+mkdir -p "${AUDIOCRAFT_OUTPUT_DIR:-/workspace/outputs}"
+mkdir -p "${AUDIOCRAFT_DATA_DIR:-/workspace/data}"
+mkdir -p "${AUDIOCRAFT_MODEL_CACHE:-/workspace/models}"
+
+# Check GPU availability
+echo "Checking GPU..."
+if command -v nvidia-smi &> /dev/null; then
+    nvidia-smi --query-gpu=name,memory.total,memory.free --format=csv
+else
+    echo "Warning: nvidia-smi not found"
+fi
+
+# Check Python and dependencies
+echo "Python version:"
+python --version
+
+echo "PyTorch version:"
+python -c "import torch; print(f'PyTorch: {torch.__version__}, CUDA: {torch.cuda.is_available()}')"
+
+# Check AudioCraft installation
+echo "AudioCraft version:"
+python -c "import audiocraft; print(audiocraft.__version__)" 2>/dev/null || echo "AudioCraft installed from source"
+
+# Generate API key if not exists
+if [ ! -f "${AUDIOCRAFT_DATA_DIR:-/workspace/data}/.api_key" ]; then
+    echo "Generating API key..."
+    python -c "
+from src.api.auth import get_key_manager
+km = get_key_manager()
+if not km.has_key():
+    key = km.generate_new_key()
+    print(f'Generated API key: {key}')
+    print('Store this key securely - it will not be shown again!')
+"
+fi
+
+# Start the application
+echo "Starting AudioCraft Studio..."
+echo "Gradio UI: http://0.0.0.0:${AUDIOCRAFT_GRADIO_PORT:-7860}"
+echo "REST API:  http://0.0.0.0:${AUDIOCRAFT_API_PORT:-8000}"
+echo "API Docs:  http://0.0.0.0:${AUDIOCRAFT_API_PORT:-8000}/api/docs"
+echo "=========================================="
+
+exec python main.py "$@"