- lowercase first letter of all logger.Info/Warn/Error message strings
in task/worker.go, task/retry_queue.go, task/handler_factory.go,
task/metrics_logger.go, task/retry_manager.go, task/queue_producer.go,
task/initializer.go, task/test_task.go, and main.go
- fix inline comments in main.go that mixed Chinese and uppercase English
- align Dockerfile comment casing with project convention
- replace interface{} with any across ~30 files for Go 1.18+ style
- adopt for-range-over-int loops in place of explicit index loops
- use maps.Copy from stdlib to replace manual map copy loops
- use min() builtin for exponential backoff delay cap in retry_manager
- add MongoDB 7.0 K8s manifests (StatefulSet, Service, PVC, Secret)
- document PostgreSQL and MongoDB deploy steps in deploy.md with SSH tunnel port mappings