test(userRoutes): add safe test server helper and mapping test for userRoutes

[MoonLGH]

What

• Added test/utils/testServer.ts as a reusable test helper for mounting userRoutes.
  • Fixed Express typing by returning void instead of Response.
  • Removed use of '*' in app.use to avoid path-to-regexp errors in Express 5.
• Cleaned up old __tests__/helpers folder (Jest was treating it as a test suite).
• Updated __tests__/api/routes/userRoutes.test.ts:
  • Imports the new helper (../../../test/utils/testServer).
  • Provides a baseline probe test ensuring the router mounts and does not produce 5xx errors.
• Ensured devDependencies (jest, ts-jest, supertest, @types/*) exist for consistent test runs.
• Kept test style consistent with existing authRoutes test suite.

Why

• Previous tests failed due to:
  • Broken relative import path mangled by the generator.
  • Express type errors (Response not assignable to void).
  • path-to-regexp crash from app.use('*', handler).
  • Jest treating helper files under __tests__ as tests.
• This patch fixes those issues and aligns the userRoutes test style with existing route tests.

How to verify

• Run npm test → all route tests (authRoutes + userRoutes) should pass.
• Coverage report includes userRoutes.

Fixes #33

[MoonLGH]

resolved the issue