Fix/job queue metrics dashboard reports progress

[DevNetlife]

Summary of Changes

Prometheus Job Queue Metrics (Closes #854)

Added job_queue_pending_total gauge with label { job_name }.
Added job_queue_failed_total counter with label { job_name }.
Added job_duration_seconds histogram with label { job_name }.
Updated GET /metrics exporter to fetch current pending job counts from pgboss.job alongside existing HTTP metrics.
Admin Job Queue Dashboard (Closes #853)

Added GET /api/v1/admin/jobs/dashboard endpoint returning { queues: [{ name, pending, active, failed, completed24h }] }.
Queries pg-boss's internal pgboss.job table and aggregates per job type.
Protected by requireApiKey.
Scheduled Report Pre-Generation via pg-boss Cron (Closes #852)

Created database migration 030_cached_reports.sql for storing cached annual vault reports.
Registered pg-boss cron schedule "5 0 1 * *" (1st of each month at 00:05 UTC) for the "report-generate" job.
Updated GET /api/v1/vaults/:contractId/report?year=YYYY to serve cached report data when available and refresh cache on scheduled runs.
Backfill Job Progress Reporting (Closes #851)

Added progress reporting to backfill workers (job.send({ progress: N })), reporting progress every 10 batches processed.
Updated GET /api/v1/admin/jobs/:jobId to include progress: number | null (0–100).
Ensured completed jobs report progress: 100.
Verification & Testing
TypeScript: Ran npx tsc --noEmit cleanly with zero type errors.
Unit Tests:
src/services/jobQueueMetrics.test.ts: Verified Prometheus metrics collection and report worker pre-generation.
src/api/controllers/admin.test.ts: Verified dashboard aggregation output and progress field in job status response.
src/services/indexerBackfillWorker.test.ts: Verified progress callback parameter passing.

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