Add timestamps to console logs

[caydyan]

Summary

• add a one-time console wrapper so raw console.log/info/warn/error/debug output gets -> YYYY-MM-DD HH:mm:ss: prefixes
• install the wrapper at app startup after the UTC timezone is set
• skip lines already formatted by the Express logger or sphinxLogger so existing timestamped logs are not double-prefixed

Bounty

Sphinx bounty feed #90: "Add timestamps to all of our logs - $@ 200,000"

Payout address: bc1qev5ant33v5y89qqjvcf4mh9hlax5svqf5xd7gc

Validation

• npx jest src/tests/unit_tests/logger.test.ts --runInBand
• npm run test-unit -- --runInBand
• npx tsc --noEmit --pretty false
• git diff --check

[caydyan]

Current-head validation rerun on 30303a261c288b5afa941ec7270f87e8031a1747:

• git diff --check origin/master...HEAD
• npx jest src/tests/unit_tests/logger.test.ts --runInBand (1 suite / 4 tests passed)
• npm run test-unit -- --runInBand (9 suites / 16 tests passed)
• npx tsc --noEmit --pretty false

Local worktree is clean after the rerun.