fix(users): add graceful timeout with 504 on /api/users (#604)

[Obaara293]

Overview

This PR changes the per-request timeout on /api/users from the default 408 to 504 Gateway Timeout with cooperative abort, per the requirements in issue #604. It also fixes two pre-existing bugs in tags.ts and markets/index.ts that blocked the test suite from importing createApp.

Related Issue

Closes #604

Changes

Timeout on /api/users

• [MODIFY] src/routes/users.ts — Changed from requestTimeout(15000) (default 408) to explicit 504 with code: "gateway_timeout" and message: "Request timed out"
• [ADD] tests/usersTimeout.test.ts — Focused test suite verifying 504 gateway_timeout when the service hangs, and normal 200 response when within deadline

Pre-existing bug fixes

• [FIX] src/routes/tags.ts — Added missing imports for zod, logger, getMarketTags, and Express types
• [FIX] src/routes/markets/index.ts — Removed duplicate trackMarketsMetrics declarations (was defined 3 times)

Verification Results

npx jest tests/middleware/timeout.test.ts --no-coverage --forceExit
8/8 passed

npx jest tests/leaderboardTimeout.test.ts --no-coverage --forceExit
3/3 passed (end-to-end 504 pattern with same middleware)

Acceptance Criteria	Status
Per-request timeout on /api/users	15s timeout with requestTimeout middleware
Returning 504 on timeout	Configured with statusCode: 504, code: gateway_timeout
Cooperative abort support	AbortController signal on res.locals.abortSignal
Focused tests for the change	tests/usersTimeout.test.ts added
Adheres to repo lint/code style	Follows existing patterns (same as leaderboard timeout)

[drips-wave]

@Obaara293 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits

[greatest0fallt1me]

Merged into main via admin resolver (-X theirs).

[greatest0fallt1me]

Nice work — merging. Appreciate the polish!