Create Backend README & Postman Collection

Description

Write comprehensive README and create Postman collection for API testing.

Acceptance Criteria

  • README.md with setup instructions
  • API endpoints documented
  • Postman collection JSON created
  • Environment variables documented
  • Testing commands documented

Implementation Steps

  1. Create backend/README.md
  2. Document installation steps
  3. Document all API endpoints
  4. Create postman_collection.json
  5. Add testing instructions

Reference

  • Roadmap: docs/roadmaps/Implementation_Roadmap_Backend.md Phase 10, Step 19-20
  • Standards: backend/CLAUDE.md

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