Fix Live Activity job scheduling with Cloud Tasks

[kswift1]

Summary

• Live Activity job scheduling now enqueues Cloud Tasks and removes the 5-second polling worker.
• Adds the internal dispatch endpoint, scheduler config/docs/workflow envs, and regression coverage for enqueue success/failure paths.

변경 유형

• feat: 새로운 기능
• fix: 버그 수정
• refactor: 코드 리팩토링
• chore: 설정, 빌드 등 기타 변경
• docs: 문서 수정
• test: 테스트 추가/수정

변경 파일

• infra/rust-backend/src/services/live_activity_service.rs
• infra/rust-backend/src/routes/internal.rs, routes/schedules.rs, routes/mod.rs
• .github/workflows/deploy-rust.yml, infra/rust-backend/.env.example, .ai/REST_API.md
• infra/rust-backend/tests/live_activity_test.rs

스크린샷 (UI 변경 시)

N/A

Test plan

• cargo test --manifest-path infra/rust-backend/Cargo.toml --test live_activity_test -- --test-threads=1
• cargo test --manifest-path infra/rust-backend/Cargo.toml --test schedules_test
• cargo test --manifest-path infra/rust-backend/Cargo.toml --test rust_migration_regression_test
• Prod smoke: /health 200, internal dispatch 401 without secret / 200 processed:false with secret
• cargo test --manifest-path infra/rust-backend/Cargo.toml --tests blocked by existing media_upload_urls_test base_path/basePath mismatch

관련 이슈

N/A

[github-actions]

✅ PR 체크 스킵

⚡ 빌드 대상 코드 변경이 없어 빌드/테스트를 건너뛰었습니다.

상세 정보

• Workflow: PR Check
• Branch: kswift1/check-neon-cu-limit
• Commit: 09c2f86
• 빌드 모드: ⚡ 스킵 (빌드 대상 변경 없음)

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the Live Activity job scheduling mechanism by replacing the existing polling worker with Google Cloud Tasks. This change aims to improve the efficiency and reliability of Live Activity updates by leveraging a managed task queue service. It introduces a new internal endpoint for task dispatch, updates configuration, and includes thorough testing to ensure the robustness of the new system.

Highlights

• Transition to Cloud Tasks: Live Activity job scheduling has been migrated from a 5-second polling worker to Google Cloud Tasks for improved efficiency and reliability.
• New Internal Dispatch Endpoint: An internal API endpoint (POST /api/v1/internal/live-activity/jobs/{job_id}/dispatch) was added to allow Cloud Tasks to trigger Live Activity job processing securely.
• Configuration and Documentation Updates: New environment variables (SCHEDULER_SECRET, LIVE_ACTIVITY_TASK_PROJECT_ID, LIVE_ACTIVITY_TASK_LOCATION, LIVE_ACTIVITY_TASK_QUEUE, LIVE_ACTIVITY_TASK_TARGET_BASE_URL) were introduced, and the API documentation was updated to reflect the new dispatch endpoint.
• Comprehensive Regression Tests: New regression tests were added to cover both successful and failed Cloud Task enqueueing scenarios, as well as the functionality of the new internal dispatch endpoint.

Ignored Files

• Ignored by pattern: .github/workflows/** (1)
  • .github/workflows/deploy-rust.yml

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[gemini-code-assist]

Code Review

This pull request transitions the Live Activity job processing from an internal background worker to an external scheduling system using Google Cloud Tasks. It introduces a LiveActivityJobScheduler trait with a Cloud Tasks implementation, adds a new internal API endpoint for job dispatching with secret-based authentication, and updates the service layer to enqueue tasks upon job creation or update. Documentation and tests have been updated to reflect these architectural changes. I have no feedback to provide.