feat: resolve issues #599, #600, #601, #602

[Chuks-coderr]

#600 — Add maskSensitive helper for structured log calls

• Add src/utils/mask-sensitive.utils.ts: maskSensitive(obj) recursively redacts url, callback, address, webhook_url, recipient keys to [REDACTED]
• Add unit tests (mask-sensitive.utils.test.ts): 30 cases covering all sensitive key names, non-sensitive keys unchanged, nested recursion, array elements, immutability, case-insensitivity
• Apply maskSensitive to the structured log call in wallet-activity.controllers.ts

#599 — Add integration test for trade history date range filter

• Extend WalletActivityQuerySchema with optional from/to ISO datetime params
• Update fetchWalletActivity to build Prisma createdAt.gte / .lte filter when from / to are supplied
• Add wallet-activity-date-filter.integration.test.ts: 11 mock-based tests covering inside/before/after range, boundary inclusivity, Prisma where clause shape, and empty-range result

#601 — Add integration test for fan portfolio aggregating holdings

• Add grand_total computation in wallet-holdings.controllers.ts (sum of all total_value entries, returned as string)
• Add fan-portfolio.integration.test.ts: 15 mock-based tests asserting all three held creators present with correct key_count/total_value, unhe ld creator absent, and grand_total sums correctly

#602 — Add structured warn log when indexer falls behind by > 50 ledgers

• Raise gap threshold in ledger-gap-detection.service.ts from 10 to 50
• Replace legacy log fields with the four required fields: latest_processed_ledger, latest_network_ledger, gap, detected_at
• Add ledger-lag-warning.unit.test.ts: 13 mock-based tests verifying warn emitted when gap > 50, not emitted at ≤ 50, all four fields present, and warn fires on every tick while gap persists

Misc: update .gitignore with editor/OS/log/temp patterns and test snapshots

Summary

Testing

• pnpm lint
• pnpm build
• pnpm exec prisma generate when schema or generated types changed

Checklist

• Linked issue or backlog item
• No secrets or live credentials added
• Docs updated if setup or env changed
• Change is scoped to one problem
  closes
  closes Add integration test for trade history endpoint returning results filtered by date range #599
  closes Add helper for masking sensitive fields before writing to structured logs #600
  closes Add integration test for fan portfolio endpoint aggregating holdings across multiple creators #601
  closes Add structured log for indexer falling behind the chain by more than 50 ledgers #602

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