Fix smoke test, complete env example, and clean unused dependencies

[0xMegie]

Summary

Closes #13

• Rewrote the app smoke test to boot AppModule with @nestjs/testing
• Added coverage for GET /health
• Completed .env.example with required app, database, Redis, auth, Stellar, and platform config
• Removed unused dependencies and stale type packages
• Added a regression test to keep required .env.example keys documented
• Exported MetricsService from MonitoringModule so dependent modules resolve correctly

Verification

• npm run build
• npm test -- --runInBand

Result: 26 test suites passed, 212 tests passed.

[oomokaro1]

Summary

Rewrites the smoke test with @nestjs/testing, adds an .env.example validation test, removes unused dependencies, and exports MetricsService. Issue requirements are fully addressed, but CI is failing due to the new smoke test.

Blocking Issues

CI Failure — Smoke test crashes in PaymentCursorService

The test fails at payment-cursor.service.ts:50:

TypeError: Cannot read properties of undefined (reading 'get')
  at PaymentCursorService.restoreCursor
  at PaymentDetectorService.onModuleInit

The mock in app.smoke.spec.ts sets RedisService.getClient to jest.fn() (returns undefined), but PaymentCursorService.restoreCursor() calls this.redis.getClient().get(...). The mock needs to return a mock client object with a .get() method, or override PaymentCursorService/PaymentDetectorService in the test module.

What's Good

• Dependency cleanup removes ~20 unused packages (socket.io, websockets, bcrypt, zod, axios-retry, redis, etc.)
• The env-example spec is a nice regression guard
• Exporting MetricsService fixes a real DI resolution issue
• The smoke test approach is sound — just needs the Redis mock fleshed out

[oomokaro1]

Review Summary

This PR fixes the smoke test, completes the , and cleans unused dependencies — all requirements from issue #13 are satisfied.

Blocking Issues

None

Code Issues

None

What's Good

• Smoke test properly rewritten with and comprehensive mocks ()
• restructured with clear Required/Optional sections
• Regression test for keys () is a helpful addition
• Unused dependencies removed: , , , , , (verified no imports in codebase)
• exported from for proper module resolution
• JWT_SECRET updated to meet 32-char minimum

CI is not configured (empty ), which is acceptable for this cleanup/fix PR.

[oomokaro1]

Review Summary

This PR fixes the smoke test, completes the .env.example, and cleans unused dependencies — all requirements from issue #13 are satisfied.

Blocking Issues

None

Code Issues

None

What's Good

• Smoke test properly rewritten with @nestjs/testing and comprehensive mocks
• .env.example restructured with clear Required/Optional sections
• Regression test for .env.example keys is a helpful addition
• Unused dependencies removed: redis, zod, bcrypt, @nestjs/websockets, @nestjs/platform-socket.io, axios-retry (verified no imports in codebase)
• MetricsService exported from MonitoringModule for proper module resolution
• jest-setup.ts JWT_SECRET updated to meet 32-char minimum

CI is not configured (empty statusCheckRollup), which is acceptable for this cleanup/fix PR.