docs: comprehensive JSDoc for Tier 2 services (dashboard, queue, jobs)

[gorkem-bwl]

Summary

Adds comprehensive JSDoc documentation for Tier 2 high-priority services following established standards from Tier 1 documentation.

Services Documented (3/3)

1. Dashboard Service (~116 lines)

• Class documentation: Statistics aggregation logic, performance characteristics
• getStats() method: Parallel database queries, caching considerations, scalability notes
• Features: Real-time platform metrics, monitoring integration

2. Queue Service (~180 lines)

• Class documentation: BullMQ integration details, architecture, configuration
• addPiiAnalysisJob() method: Job lifecycle, retry strategy, queue behavior
• getQueueStats() method: Monitoring recommendations, state transitions
• healthCheck() method: Redis connectivity checks, error handling

3. Jobs Service (~430 lines)

• Class documentation: Job lifecycle management, business rules, integration points
• findAll() method: Pagination, filtering, user isolation, performance details
• getStats() method: Status aggregation, monitoring insights
• findOne() method: Access control, relations, data transformation
• retryJob() method: Retry logic, metadata tracking, audit logging
• cancelJob() method: Cancellation rules, dataset status updates, worker integration

Documentation Standards Applied

✅ TSDoc/JSDoc Compliance: @param, @returns, @throws, @remarks, @example, @see, @SInCE tags
✅ Performance Characteristics: Query times, indexing, scalability notes
✅ Use Cases: Real-world usage scenarios and integration examples
✅ Business Rules: Status validation, access control, data integrity
✅ Architecture Details: Service relationships, data flow, design patterns
✅ Code Examples: Practical usage with expected outputs
✅ Error Handling: Exception scenarios and recovery strategies

Total Documentation Added

• ~726 lines of comprehensive JSDoc across 3 services
• 3 commits with detailed commit messages
• 100% method coverage for all public APIs

Related PRs

• PR docs: add comprehensive inline JSDoc documentation for Tier 1 authentication #12: Tier 1 documentation (auth, users, security, projects, policies, datasets) - Merged
• PR docs: complete datasets.service.ts comprehensive JSDoc documentation #13: Datasets service completion documentation - Open

Testing

• ✅ All TypeScript compilation passes
• ✅ Documentation accurately reflects actual code implementation
• ✅ No breaking changes to functionality

Next Steps

After merging this PR, will continue with Tier 2 medium-priority services:

• yaml-validation.service.ts
• sse.service.ts
• audit.service.ts

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📥 Commits

Reviewing files that changed from the base of the PR and between ac068f5 and 44fbc50.

📒 Files selected for processing (3)

• apps/api/src/dashboard/dashboard.service.ts (1 hunks)
• apps/api/src/jobs/jobs.service.ts (5 hunks)
• apps/api/src/queue/queue.service.ts (4 hunks)

✨ Finishing touches

• 📝 Generate Docstrings

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch docs/tier2-dashboard-queue-jobs

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