fix(health): 统一随访类型为 5 种 — phone/outpatient/home_visit/online/wechat

- validation.rs: face_to_face 替换为 outpatient，新增 home_visit/wechat
- FollowUpTaskList.tsx: 新增 online 选项，与后端对齐
- 迁移 078: follow_up_task + follow_up_record face_to_face → outpatient

apps/web/src/pages/health/FollowUpTaskList.tsx

@@ -34,6 +34,7 @@ const FOLLOW_UP_TYPE_OPTIONS = [
   { value: 'phone', label: '电话' },
   { value: 'outpatient', label: '门诊' },
   { value: 'home_visit', label: '家访' },
+  { value: 'online', label: '线上' },
   { value: 'wechat', label: '微信' },
 ];
 
@@ -41,6 +42,7 @@ const FOLLOW_UP_TYPE_MAP: Record<string, string> = {
   phone: '电话',
   outpatient: '门诊',
   home_visit: '家访',
+  online: '线上',
   wechat: '微信',
 };