feat(metadb): add protobuf envelope storage with compression and operational tooling#14
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- Define MetadataEnvelope protobuf with content type, compression, integrity, TTL, and blob refs
- Add zstd compression for payloads > 2KB with automatic decompression and digest verification
- Implement envelope-aware BoltDB APIs (PutEnvelope, GetEnvelope, DeleteEnvelope, UpdateEnvelope)
- Add EnvelopeIndex wrapper with JSON/raw byte convenience methods and negative caching
- Create EnvelopeReaper for batch expiry deletion with configurable interval and max duration
- Add operational tooling: VerifyEnvelopeRefcounts, RebuildEnvelopeRefcounts, EnvelopeStats, InspectEnvelope
- Support protocol|kind|key storage format for multi-kind protocols (e.g., goproxy: mod, info, list)
…ational tooling - Define MetadataEnvelope protobuf with content type, compression, integrity, TTL, and blob refs - Add zstd compression for payloads > 2KB with automatic decompression and digest verification - Implement envelope-aware BoltDB APIs (PutEnvelope, GetEnvelope, DeleteEnvelope, UpdateEnvelope) - Add EnvelopeIndex wrapper with JSON/raw byte convenience methods and negative caching - Create EnvelopeReaper for batch expiry deletion with configurable interval and max duration - Add operational tooling: VerifyEnvelopeRefcounts, RebuildEnvelopeRefcounts, EnvelopeStats, InspectEnvelope - Support protocol|kind|key storage format for multi-kind protocols (e.g., goproxy: mod, info, list)
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