Add /api global prefix to all NestJS routes

[Copilot]

All API routes now serve under /api prefix for consistent namespacing.

Changes

• Main application (apps/api/src/main.ts)

  • Set app.setGlobalPrefix("api") to prefix all controller routes
  • Moved Swagger UI from /api → /api-docs to avoid path collision

• E2E tests (apps/api/src/users/__tests__/user.controller.e2e-spec.ts)

  • Updated endpoint paths: /users → /api/users

Routing structure

Before:
  /users           → UsersController
  /health          → HealthController
  /api/auth/*      → Better Auth (middleware)
  /api             → Swagger UI

After:
  /api/users       → UsersController
  /api/health      → HealthController
  /api/auth/*      → Better Auth (unchanged, direct Express mount)
  /api-docs        → Swagger UI

Better Auth routes unchanged—middleware mounts directly on Express at /api/auth, bypassing NestJS global prefix.

Original prompt

We need to adjust the API app so the whole app is accessible at /api prefix

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