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
2026-04-28 16:27:14 +02:00
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+.direnv/
+result
+server
+*.exe
+*.test
+*.out
+.env
+*.log
+vendor/
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+docs/research/*/repo/
+docs/research/*/repo-index/