weicao 44f08eee68 Add metrics service with user registration API endpoints ...

- Add complete metrics microservice structure
- Implement StarRocks database integration
- Add user registration data query APIs:
  - Daily registered users by date range
  - Recent N days registration data
  - Registration data by start date and days
  - Registration summary statistics
- Add comprehensive error handling and logging
- Include test scripts and documentation

2025-09-11 17:35:20 +08:00

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