feat: initial implementation of metadata aggregator

- gRPC service with MusicBrainz provider
- PostgreSQL schema with migrations
- Service layer with database-first caching
- Repository pattern for data access
- YAML configuration support
- Research documentation for 17 music metadata projects

docs/research/bedrock-api/README.md

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+# Bedrock-API
+
+## Overview
+
+Multi-source music streaming aggregator written in Go. Provides unified gRPC API across multiple streaming platforms with cross-platform track bridging.
+
+## Key Features
+
+- **API**: gRPC + HTTP streaming proxy
+- **Performance**: High-performance Go implementation
+- **Bridging**: Resolves non-streamable tracks to playable alternatives
+- **Auth**: JWT with PostgreSQL backend
+- **License**: MIT
+
+## Source
+
+| Resource | URL |
+|----------|-----|
+| **Repository** | https://github.com/feralbureau/bedrock-api |
+
+## Supported Providers
+
+| Provider | Metadata | Search | Streaming | Playlist | Bridge |
+|----------|----------|--------|-----------|----------|--------|
+| Spotify | Yes | Yes | Bridged | Yes | SoundCloud |
+| SoundCloud | Yes | Yes | Yes | Yes | - |
+| Deezer | Yes | Yes | Bridged | Yes | SoundCloud |
+| YouTube Music | Yes | Yes | Limited | Yes | SoundCloud |
+| Yandex | Partial | Partial | - | - | - |
+| VK | Partial | Partial | - | - | - |
+
+## Architecture
+
+- **Unified gRPC/Protobuf models** for all music entities
+- **Cross-platform bridging** - resolves non-streamable tracks
+- **Parallel provider searches** with Go concurrency
+- **HTTP streaming proxy** with range request support
+- **Lyrics integration** (LrcLib, Genius in progress)
+
+## Self-Hosting
+
+```bash
+git clone https://github.com/feralbureau/bedrock-api.git
+cd bedrock-api
+
+# Configure providers and database
+cp config.example.yaml config.yaml
+
+# Run
+go run .
+```
+
+## Notes
+
+- Best for streaming aggregation use cases
+- gRPC for high performance
+- Automatic track resolution across platforms