- Introduced `JwtValidatorPlugin` (DOMAIN): Validates JWT tokens for protected API endpoints using HAProxy's JWT functionality.
- Added configuration options: `enabled`, `algorithm`, `issuer`, `audience`, `pubkey_path`, and `pubkey`.
- Documented the plugin setup and usage in `plugins.md` and `plugin-development.md`.
- Created fixtures for `services-with-jwt-validator`.
- Added extensive test cases to validate configuration and HAProxy output generation.
- Ensured seamless integration into the plugin framework alongside existing domain plugins.
