Implemented the queue-backed execution path#416
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Closes #348
Implemented the queue-backed execution path and moved the first reliability-critical flows onto it.
The core is a durable Postgres job table plus leased workers in src/jobs/job.entity.ts, src/jobs/jobQueue.service.ts, src/jobs/jobWorker.ts, and src/jobs/jobHandlers.ts. Jobs now support delayed availability, lease renewal, retries with backoff, dead-lettering, per-user correlation, and queue stats. The schema is added in src/migrations/1773000000000-CreateJobQueue.ts, and the worker boots with the API server in src/index.ts.
I rewired delayed transaction submission to enqueue durable jobs instead of keeping in-memory timers in src/services/delayedTransaction.service.ts. I also moved funding-triggered deployment work off the webhook request path in src/Gateway/webhook.service.ts, backed webhook idempotency with the DB helper more defensibly in src/Gateway/webhookIdempotency.service.ts, and added admin observability endpoints for queue stats and dead-letter inspection in src/Gateway/routes.ts. I added focused tests in tests/unit/job_worker.test.ts and tests/unit/delayedTransaction.service.test.ts.
Verification is still incomplete here because this checkout does not have installed Node tooling: npm run build failed with tsc: command not found, and there is no local node_modules/.bin/tsc. Before shipping, the next step is to restore dependencies, run the migration, then run npm run build and the targeted Jest tests.