Add `POST /admin/masters/{id}/keys` allowing admins to issue child keys
on behalf of a master. Introduce an `issued_by` field in the Key model
to audit whether a key was issued by the master or an admin.
Refactor master service to use typed errors for consistent HTTP status
mapping and ensure validation logic (active status, group check) is
shared.
Add FeatureHandler to manage lightweight runtime configuration toggles
stored in the Redis `meta:features` hash. This enables dynamic control
over system behavior (e.g., storage backends) via the admin API.
- Add `GET /admin/features` to list flags
- Add `PUT /admin/features` to update flags
- Update README with feature flag documentation
Introduce a middleware layer to attach a unique identifier to each HTTP request for observability purposes. The identifier is propagated via the X-Request-ID header, allowing for correlation of logs and events across distributed system components.
- Replace direct zerolog usage with standard library `log/slog` in business code
- Add `internal/logging` package with zerolog bridge handler for structured output
- Create `internal/jsoncodec` package to centralize JSON encoding/decoding using Sonic
- Update all services and main entry point to use new logging interface
- Maintain backward compatibility with existing zerolog console output
- Remove custom logger setup in favor of structured logging bridge
- Integrate `rs/zerolog` for structured and leveled logging
- Add `EZ_LOG_LEVEL` environment variable support (default: info)
- Configure console output with timestamps and service fields
- Migrate `main.go` and `LogWriter` to use the new logger instance
- Update README with logging configuration and design details
- Move integration tests and mock upstream resources from `integration/` to `test/` directory.
- Add `test/integration.sh` script to orchestrate environment setup and test execution.
- Update build context in `docker-compose.integration.yml` to match new structure.
- Add documentation for local development and integration testing workflows in README.
Replace placeholder with comprehensive documentation including:
- System goals and control plane responsibilities
- Architecture design and technology stack
- API endpoint reference for management and system interfaces
- Configuration variables and default values
- Deployment instructions for local and Docker environments
