Add retry exhaustion logging for indexer DLQ transitions

[EmeditWeb]

Close #229

Summary

When an indexer job exhausts its retry budget and is moved to the DLQ, emit a warning log with the job type, retry context, sanitized payload, failure reason, and error details.

What changed

• src/utils/indexer-dlq.utils.ts
  • Added a call to logRetryExhaustion(...) inside moveToDLQ
• docs/indexer/DLQ_WORKFLOW.md
  • Documented the new warning log for retry exhaustion
• src/utils/test/indexer-dlq.utils.test.ts
  • Added a unit test to assert that logRetryExhaustion is called with the expected parameters

Testing

• Run the relevant unit test(s):
  • pnpm test src/utils/test/indexer-dlq.utils.test.ts
• Confirm moveToDLQ triggers the warning log helper before creating the DLQ record

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