LOOPIN-026B — Perform integration testing of backend API flow

[shaig-mahmudov]

• Type: QA
• Priority: High
• Branch: qa/LOOPIN-026B-backend-api-flow-testing
• Description: Execute end-to-end integration tests over core endpoint flows from authentication to badge assignment.
• Acceptance Criteria:
  • Core workflows pass testing checks.
  • Status codes match specifications.