Task/users inttest

[d3v-active]

Closes #354

This PR adds end-to-end integration tests for the users endpoints (buffer #18).

Changes Made

• Created tests/integration/users.test.ts to implement tests for the users route.
• Tested endpoints:
  • GET /api/users/me
  • GET /api/users/:address/predictions
  • GET /api/users/:stellarAddress/profile
• Checked inputs using the application's boundary validations, ensuring they return the correct standardized error envelope (e.g. invalid_address).
• Isolated the tested endpoints gracefully using mock implementations of unrelated dependency layers and routers to keep testing fast and focused.

Acceptance Criteria Met

• Implementation matches the description.
• Tests added and passing.
• Input validation at the boundary verified.

[drips-wave]

@d3v-active Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

Learn more about application limits