fix: add request ID tracking for production debugging

[0x-SquidSol]

Summary

• Issue: Zero request correlation existed. If a user reported "I got a 500 at 3:15pm", ops could not find that specific request in logs or Sentry. No X-Request-Id header, no per-request identifier in logs, no correlation in Sentry events.
• Fix: Adds Hono's built-in requestId() middleware for end-to-end request tracing.

How it works

1. Middleware generates a UUID per request (or respects incoming X-Request-Id from load balancers)
2. Response header X-Request-Id set on all responses — clients can quote it in bug reports
3. Sentry tags every scope with request_id — filterable in Sentry dashboard
4. Error responses include requestId field in JSON body:

   { "error": "Internal server error", "requestId": "550e8400-e29b-41d4-a716-446655440000" }

5. Error logs include requestId for grep/search correlation

Changes

File	Change
src/index.ts	Import + register requestId() middleware; add requestId to error handler logs + response
src/middleware/sentry.ts	Tag Sentry scope with request_id

Test plan

• tsc --noEmit passes
• vitest run passes (186/186 tests)
• Manual: verify X-Request-Id header appears in responses
• Manual: verify Sentry events are tagged with request_id

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between ed06944 and 191adca.

📒 Files selected for processing (3)

• src/index.ts
• src/middleware/sentry.ts
• tests/routes/prices.test.ts

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[0x-SquidSol]

⚠️ Merge conflict — needs rebase against current main

This PR has merge conflicts in src/index.ts and src/middleware/sentry.ts due to upstream changes:

• src/index.ts: Supabase env validation (fix: validate Supabase environment variables at startup #128), API_PORT validation (fix: validate API_PORT is a valid integer in range 1-65535 #130), startup alert fire-and-forget (fix: handle startup alert failure as fire-and-forget #125), uncaughtException handlers (fix: add process-level uncaughtException and unhandledRejection handlers #124), price timer cleanup on shutdown (fix: clean up price update timers during graceful shutdown #137)
• src/middleware/sentry.ts: Error resilience wrapping (fix: add error resilience to cache and Sentry middleware #139)

The fix itself is still needed — no merged PR adds request ID / X-Request-Id correlation tracking. This is a new observability feature.

To resolve: Rebase against main and resolve conflicts. The requestId() middleware import and registration just need to be placed in the updated middleware chain, and the Sentry scope tag needs to go inside the updated withScope block.