Promote async RAG reload fix

[rktclgh]

Summary

• promote the asynchronous admin comprehensive RAG reload fix from develop to main
• this prevents Cloudflare 524 responses by returning a job snapshot immediately and polling status while the background reload continues

Verification

• PR Run admin RAG reloads asynchronously #75 backend-ci passed
• Local backend tests passed on issue/be-rag-admin-reload-async:
  • git diff --check
  • ./gradlew test --tests com.fairing.fairplay.ai.rag.service.RagLoadJobServiceTest --no-daemon
  • ./gradlew test --no-daemon

Notes

• Gemini Code Assist and CodeRabbit both reported quota/rate-limit notices on PR Run admin RAG reloads asynchronously #75, with no actionable review findings available.

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