Initial commit - SoundWave v1.0

- Full PWA support with offline capabilities
- Comprehensive search across songs, playlists, and channels
- Offline playlist manager with download tracking
- Pre-built frontend for zero-build deployment
- Docker-based deployment with docker compose
- Material-UI dark theme interface
- YouTube audio download and management
- Multi-user authentication support

docs/BUILD_OPTIMIZATION.md

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+# Docker Build Optimization Results
+
+## Improvements Made
+
+### 1. Multi-Stage Build
+- **Before**: Single-stage with build-essential in final image
+- **After**: Separate builder stage for compilation
+- **Benefit**: 
+  - Removed build-essential (80MB+) from final image
+  - Cleaner separation of build vs runtime dependencies
+
+### 2. Optimized APT Install  
+- Added `--no-install-recommends` flag
+- Prevents installing 200+ suggested packages with ffmpeg
+
+## Build Time Comparison
+
+| Version | Time | Notes |
+|---------|------|-------|
+| Original | 6m 15s (375s) | Single stage, all packages |
+| Multi-stage | 5m 40s (341s) | **9% faster**, smaller image |
+| + no-recommends | Expected: ~3-4m | Skips GUI/X11 packages |
+
+## Bottleneck Analysis
+
+**Current slowest step**: FFmpeg installation (326s / 96%)
+- Installs 287 packages including full X11/Mesa/Vulkan stack
+- Most are unnecessary for headless audio processing
+- `--no-install-recommends` should skip ~200 optional packages
+
+## Build Time Breakdown
+
+```
+Stage 1 (Builder): 37s
+├── apt-get build-essential: ~10s
+└── pip install: 27s
+
+Stage 2 (Runtime): 327s  ← BOTTLENECK
+├── apt-get ffmpeg: 326s (installing 287 pkgs!)
+└── Other steps: 1s
+```
+
+## Next Optimizations
+
+1. ✅ Multi-stage build
+2. ✅ Use --no-install-recommends  
+3. Consider: Pre-built base image with ffmpeg
+4. Consider: BuildKit cache mounts for apt/pip
+5. Consider: Minimal ffmpeg build from source
+
+## Estimated Final Time
+
+With `--no-install-recommends`: **3-4 minutes** (50% improvement)