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/download_models.py

@@ -0,0 +1,116 @@
+#!/usr/bin/env python3
+"""Pre-download AudioCraft models for faster startup."""
+
+import argparse
+import os
+from pathlib import Path
+
+
+def download_musicgen_models(variants: list[str] = None):
+    """Download MusicGen models."""
+    from audiocraft.models import MusicGen
+
+    variants = variants or ["small", "medium", "large", "melody"]
+
+    for variant in variants:
+        print(f"Downloading MusicGen {variant}...")
+        try:
+            model = MusicGen.get_pretrained(f"facebook/musicgen-{variant}")
+            del model
+            print(f"  ✓ MusicGen {variant} downloaded")
+        except Exception as e:
+            print(f"  ✗ Failed to download MusicGen {variant}: {e}")
+
+
+def download_audiogen_models():
+    """Download AudioGen models."""
+    from audiocraft.models import AudioGen
+
+    print("Downloading AudioGen medium...")
+    try:
+        model = AudioGen.get_pretrained("facebook/audiogen-medium")
+        del model
+        print("  ✓ AudioGen medium downloaded")
+    except Exception as e:
+        print(f"  ✗ Failed to download AudioGen: {e}")
+
+
+def download_magnet_models(variants: list[str] = None):
+    """Download MAGNeT models."""
+    from audiocraft.models import MAGNeT
+
+    variants = variants or ["small", "medium", "audio-small-10secs", "audio-medium-10secs"]
+
+    for variant in variants:
+        print(f"Downloading MAGNeT {variant}...")
+        try:
+            model = MAGNeT.get_pretrained(f"facebook/magnet-{variant}")
+            del model
+            print(f"  ✓ MAGNeT {variant} downloaded")
+        except Exception as e:
+            print(f"  ✗ Failed to download MAGNeT {variant}: {e}")
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Pre-download AudioCraft models")
+    parser.add_argument(
+        "--models",
+        nargs="+",
+        choices=["musicgen", "audiogen", "magnet", "all"],
+        default=["all"],
+        help="Models to download",
+    )
+    parser.add_argument(
+        "--musicgen-variants",
+        nargs="+",
+        default=["small", "medium"],
+        help="MusicGen variants to download",
+    )
+    parser.add_argument(
+        "--magnet-variants",
+        nargs="+",
+        default=["small", "medium"],
+        help="MAGNeT variants to download",
+    )
+    parser.add_argument(
+        "--cache-dir",
+        type=str,
+        default=None,
+        help="Model cache directory",
+    )
+
+    args = parser.parse_args()
+
+    # Set cache directory
+    if args.cache_dir:
+        os.environ["HF_HOME"] = args.cache_dir
+        os.environ["TORCH_HOME"] = args.cache_dir
+        Path(args.cache_dir).mkdir(parents=True, exist_ok=True)
+
+    models = args.models
+    if "all" in models:
+        models = ["musicgen", "audiogen", "magnet"]
+
+    print("=" * 50)
+    print("AudioCraft Model Downloader")
+    print("=" * 50)
+    print(f"Cache directory: {os.environ.get('HF_HOME', 'default')}")
+    print(f"Models to download: {models}")
+    print("=" * 50)
+
+    if "musicgen" in models:
+        download_musicgen_models(args.musicgen_variants)
+
+    if "audiogen" in models:
+        download_audiogen_models()
+
+    if "magnet" in models:
+        download_magnet_models(args.magnet_variants)
+
+    print("=" * 50)
+    print("Download complete!")
+    print("=" * 50)
+
+
+if __name__ == "__main__":
+    main()