Move rlz/ backend from git submodule to first-class source tree.
Includes all RuoYi 3.8.3 backend source, mapper XMLs, SQL scripts,
Dockerfile, and build configs. Also adds frontend enhancements:
- Order management: status filters, refund review, settlement (Issue #14)
- Hospital management: level/description/image fields (Issue #16)
- User management: type filter, userLevel, stats endpoint (Issue #17)
- Dev environment: application-dev.yml for rlz_dev database
- CI/CD: Drone pipeline configuration (.drone.yml)
- Mini program: API config extraction (coupon/utils/config.js)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
