Integrate BACKBEAT SDK and resolve KACHING license validation

Major integrations and fixes:
- Added BACKBEAT SDK integration for P2P operation timing
- Implemented beat-aware status tracking for distributed operations
- Added Docker secrets support for secure license management
- Resolved KACHING license validation via HTTPS/TLS
- Updated docker-compose configuration for clean stack deployment
- Disabled rollback policies to prevent deployment failures
- Added license credential storage (CHORUS-DEV-MULTI-001)

Technical improvements:
- BACKBEAT P2P operation tracking with phase management
- Enhanced configuration system with file-based secrets
- Improved error handling for license validation
- Clean separation of KACHING and CHORUS deployment stacks

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

vendor/github.com/nats-io/nkeys/MAINTAINERS.md

@@ -0,0 +1,8 @@
+# Maintainers
+
+Maintainership is on a per project basis.
+
+### Maintainers
+  - Derek Collison <derek@nats.io> [@derekcollison](https://github.com/derekcollison)
+  - Ivan Kozlovic <ivan@nats.io> [@kozlovic](https://github.com/kozlovic)
+  - Waldemar Quevedo <wally@nats.io> [@wallyqs](https://github.com/wallyqs)