refactor: de-submodule rlz backend and integrate all source code

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>

.drone.yml

@@ -0,0 +1,49 @@
+# Drone CI 配置 - RLZ 陪诊项目
+# 触发条件: push 到 main 分支时自动构建并部署
+# 需要先在 Gitea (http://101.43.95.130:3001) 的 Drone 中激活 admin/rlz 仓库
+
+kind: pipeline
+type: docker
+name: rlz-deploy
+
+trigger:
+  branch:
+    - main
+  event:
+    - push
+
+steps:
+  # Step 1: 构建 Java 后端
+  - name: build-backend
+    image: maven:3.8-openjdk-8
+    commands:
+      - cd rlz
+      - mvn clean package -DskipTests
+
+  # Step 2: 构建 Docker 镜像并重启服务
+  - name: docker-deploy
+    image: docker:latest
+    volumes:
+      - name: docker_sock
+        path: /var/run/docker.sock
+    commands:
+      - cd rlz
+      - docker build -t rlz-backend:latest .
+      - cd ..
+      - docker compose up -d --build
+    depends_on:
+      - build-backend
+
+  # Step 3: 健康检查
+  - name: healthcheck
+    image: curlimages/curl:latest
+    commands:
+      - sleep 10
+      - curl -sS http://127.0.0.1:8039/captchaImage | head -c 120
+    depends_on:
+      - docker-deploy
+
+volumes:
+  - name: docker_sock
+    host:
+      path: /var/run/docker.sock