feat: add ai release specialist prompt debug api

[huanghongbo-hhb]

Summary

• add AI release specialist workflow job backend plumbing
• add a debug API that builds prompt from workflow/task/job runtime context

Why

• let product validate prompt behavior with real workflow context before finalizing the final flow

Risk / Compatibility

• low risk: this only adds a new job type and a new workflow v4 debug API
• the debug API requires an existing workflow/task/job context and can optionally call the default LLM integration

Test

• GOCACHE=/private/tmp/zadig-gocache go test -vet=off ./pkg/microservice/aslan/core/workflow/service/workflow ./pkg/microservice/aslan/core/common/service/workflowcontroller/jobcontroller

Contact: huanghongbo@koderover.com

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