chore: 干净 ERP 基座 — 删除 health/ai/wechat 业务代码

删除内容:
- 前端: health/(67文件), ai/(2文件), Copilot, MediaPicker, 相关API/Store/Hook
- 后端: wechat_handler, wechat_service, wechat_user entity, analytics handler, ai_workflow_seed
- 配置: WechatConfig, AppConfig.wechat, AuthState wechat 字段
- 启动: 微信凭据检查块, ensure_ai_workflows() 调用
- 迁移: 新增 m20260613_000170_drop_wechat_users.rs
- 脚本: api_test_health_alert.py, api_test_mp.py, mpsync.sh/ps1
- E2E: health-data page, flows/ 目录

保留: erp-core/auth/workflow/message/config/plugin + 基座前端 + 通用组件

package.json

@@ -0,0 +1,19 @@
+{
+  "name": "erp",
+  "private": true,
+  "scripts": {
+    "start:dev": "powershell -ExecutionPolicy Bypass -File ./dev.ps1",
+    "start:stop": "powershell -ExecutionPolicy Bypass -File ./dev.ps1 -Stop",
+    "start:restart": "powershell -ExecutionPolicy Bypass -File ./dev.ps1 -Restart",
+    "start:status": "powershell -ExecutionPolicy Bypass -File ./dev.ps1 -Status",
+    "prepare": "simple-git-hooks"
+  },
+  "simple-git-hooks": {
+    "pre-commit": "npx lint-staged"
+  },
+  "devDependencies": {
+    "js-yaml": "^4.1.1",
+    "lint-staged": "^15.0.0",
+    "simple-git-hooks": "^2.12.0"
+  }
+}