Promote synvya-staging to production (local dev config)

[alejandro-runner]

Summary

• Update .env.example with expanded local dev configuration
• Fix Dockerfile to avoid strict Rust check errors during build
• Expand docker-compose.yml with local dev services and config
• Update BUNKER_RELAYS, ALLOWED_PUBKEYS, and TENANT_DOMAINS for local use
• Use local.synvya.com for local hosting
• Clean up Synvya architecture and deployment docs

Test plan

• Verify Docker build completes without errors
• Confirm local dev environment starts with updated docker-compose
• Smoke-test NIP-46 signing with updated bunker relay config

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