feat add integration-test

[ONEONUORA]

Summary

This PR implements four independent improvements across the indexer, webhook, and creator modules.

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Changes

1. Indexer — Sell Event Persistence Pipeline

New file:

src/modules/indexer/indexer-pipeline.service.ts

Implements a trade event processing pipeline for on-chain KEY_BOUGHT and KEY_SOLD events sourced from the Soroban indexer.

Features

• processTradeEvents(events) — entry point; delegates to processIndexerChainEvents for deduplication and sequential processing.
• Validates eventType.
• Ensures all required fields are present:
  • creatorId
  • actor
  • amount
  • price
  • feePaid
  • tradeAt
  • ledger
  • txHash
  • eventIndex
• Skips malformed events with a warn log.
• For valid events:
  • Creates an Activity record.
  • Calls updateOwnership with a signed balance delta.
  • Upserts CreatorPriceSnapshot.

New file:

src/modules/indexer/indexer-pipeline.integration.test.ts

Includes 3 integration tests covering:

• Happy path
• Deduplication
• Malformed event handling

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2. Webhooks — Delivery Attempt Logging

Modified:

src/modules/webhooks/webhook.service.ts

attemptDelivery now emits a structured logger.info after every delivery attempt with:

• webhook_id
• event_type
• attempt_number
• response_status (HTTP status or null on timeout/error)
• duration_ms
• success

The callback URL is never logged.

Modified:

src/modules/webhooks/webhook.service.test.ts

Updated assertions verify:

• All six logging fields on success
• Retry paths
• callbackUrl is absent from every log entry

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3. Trading Volume — Rolling Window Boundary Tests

Modified:

src/utils/__tests__/trading-volume.utils.test.ts

Added a Rolling 24-hour Window Boundary Behaviors test suite using fake timers.

Scenario	Expected
Trade exactly 24h ago	Included (gte is inclusive)
Trade 24h + 1ms ago	Excluded
Trade 1 second ago	Included
No trades in window	Returns 0n

close #624
close #626
close #627
close #628

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