feat: expose Helm service Values OpenAPI

[huanghongbo-hhb]

Summary

• Add Helm service lifecycle and environment Values OpenAPI endpoints.

Why

• Expose existing backend capabilities to CLI and automation with revision-safe updates.

Main Changes

• Add service template create/detail/update/delete and environment Values query/source/preview/update routes.
• Reuse Zadig Values merging and shared sensitive-key masking; preserve Secret references.
• Support project-scoped code hosts, manual other imports, and document the contract.

Risk / Compatibility

• New endpoints are additive; existing routes and deployment flow remain unchanged.
• effective_values_yaml reports saved Zadig configuration, not live Helm state.

Test

• go test ./pkg/util -run TestSensitiveKeyOperationLogCompatibility -count=1
• go test ./pkg/microservice/aslan/core/environment/service -run Test(OpenAPI|ValidateOpenAPI|BuildOpenAPI) -count=1
• go test ./pkg/microservice/aslan/core/service/service -count=1
• Handler packages compile with go test ... -run ^$.
• Existing common/util full suite remains blocked by the pre-existing HookPayload.RawPayload error.

Contact

• Contact: huanghongbo@koderover.com

---

This change is