feat: add CLI context OpenAPI

[huanghongbo-hhb]

Summary

• Add authenticated GET /openapi/system/cli-context for Zadig CLI clients.
• Provide an authoritative source for user identity, edition, features, and server version.

Main Changes

• Require a parseable Bearer identity before loading authorization context.
• Return only contracted principal fields and omit license payload details.
• Map edition, license status, features, version, and request ID from existing services.

Risk / Compatibility

• Additive endpoint; existing routes and response contracts are unchanged.
• License service availability is required for a successful response.

Test

• Verified service mapping and handler route/auth behavior locally.
• Full service tests remain blocked by existing workwx.go vet errors.
  Contact: huanghongbo@koderover.com

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