chore(deps): clean up Go dependencies after DID generator removal
Remove unused dependencies that were only needed for Coves-side DID
generation and key management, which has been delegated to the PDS
in V2.0 architecture.
Changes:
- Remove unused crypto libraries
- Update go.mod and go.sum after dependency cleanup
- Simplify dependency tree
The PDS now handles all cryptographic operations for community DIDs,
reducing our dependency footprint and maintenance burden.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>