[jeffrey-graham]

Summary

• Adds an unrated GET /api/health route (frontend/src/app/api/health/route.ts):
  • Default cheap liveness check (GET /api/health) responds immediately with 200 OK ({ "status": "ok" }, Cache-Control: no-store) without calling Horizon, Soroban RPC, or PostgreSQL.
  • Optional deep check (GET /api/health?deep=1) probes Horizon, Soroban RPC (getHealth), and PostgreSQL (SELECT 1 when DATABASE_URL is configured), returning 200 when all dependencies are healthy and 503 with per-dependency status/error details when any dependency fails.
• Updates the frontend service healthcheck in docker-compose.yml to probe http://127.0.0.1:3000/api/health instead of /.
• Adds unit tests in frontend/src/app/api/health/route.test.ts covering liveness and deep dependency failure reporting.

Verification

• Ran npx eslint src/app/api/health/route.ts src/app/api/health/route.test.ts src/lib/indexed-db.ts and npx vitest run src/app/api/health/route.test.ts src/lib/indexed-db.test.ts in frontend/.

Closes #312

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