perf(health): 随访列表内联负责人名称 — 消除 N+1 查询

follow_up list_tasks 批量查询 users 表获取 assigned_to_name，
前端移除 doctorLabels 逐条请求缓存，直接使用后端内联字段。

crates/erp-health/src/dto/follow_up_dto.rs

@@ -50,6 +50,8 @@ pub struct FollowUpTaskResp {
     pub patient_id: Uuid,
     pub assigned_to: Option<Uuid>,
     pub patient_name: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub assigned_to_name: Option<String>,
     pub follow_up_type: String,
     pub planned_date: NaiveDate,
     pub status: String,

crates/erp-health/src/service/follow_up_service.rs

@@ -68,9 +68,32 @@ pub async fn list_tasks(
         HashMap::new()
     };
 
+    // 批量查询 assigned_to_name（从 users 表）
+    let assigned_ids: HashSet<Uuid> = models.iter().filter_map(|m| m.assigned_to).collect();
+    let assigned_names: HashMap<Uuid, String> = if !assigned_ids.is_empty() {
+        let ids_csv = assigned_ids.iter().map(|id| format!("'{}'", id)).collect::<Vec<_>>().join(",");
+        let sql = format!(
+            "SELECT id, COALESCE(display_name, username) AS name FROM users WHERE id IN ({}) AND tenant_id = '{}'",
+            ids_csv, tenant_id
+        );
+        let rows = state.db.query_all(sea_orm::Statement::from_string(
+            sea_orm::DatabaseBackend::Postgres, sql,
+        )).await?;
+        rows.into_iter()
+            .filter_map(|row| {
+                let id: Uuid = row.try_get_by_index(0).ok()?;
+                let name: String = row.try_get_by_index(1).ok()?;
+                Some((id, name))
+            })
+            .collect()
+    } else {
+        HashMap::new()
+    };
+
     let data = models.into_iter().map(|m| FollowUpTaskResp {
         id: m.id, patient_id: m.patient_id, assigned_to: m.assigned_to,
         patient_name: patient_names.get(&m.patient_id).cloned(),
+        assigned_to_name: m.assigned_to.and_then(|uid| assigned_names.get(&uid).cloned()),
         follow_up_type: m.follow_up_type, planned_date: m.planned_date,
         status: m.status, content_template: m.content_template,
         related_appointment_id: m.related_appointment_id,
@@ -95,7 +118,7 @@ pub async fn get_task(
 
     Ok(FollowUpTaskResp {
         id: m.id, patient_id: m.patient_id, assigned_to: m.assigned_to,
-        patient_name: None,
+        patient_name: None, assigned_to_name: None,
         follow_up_type: m.follow_up_type, planned_date: m.planned_date,
         status: m.status, content_template: m.content_template,
         related_appointment_id: m.related_appointment_id,
@@ -156,7 +179,7 @@ pub async fn create_task(
 
     Ok(FollowUpTaskResp {
         id: m.id, patient_id: m.patient_id, assigned_to: m.assigned_to,
-        patient_name: None,
+        patient_name: None, assigned_to_name: None,
         follow_up_type: m.follow_up_type, planned_date: m.planned_date,
         status: m.status, content_template: m.content_template,
         related_appointment_id: m.related_appointment_id,
@@ -227,7 +250,7 @@ pub async fn update_task(
 
     Ok(FollowUpTaskResp {
         id: m.id, patient_id: m.patient_id, assigned_to: m.assigned_to,
-        patient_name: None,
+        patient_name: None, assigned_to_name: None,
         follow_up_type: m.follow_up_type, planned_date: m.planned_date,
         status: m.status, content_template: m.content_template,
         related_appointment_id: m.related_appointment_id,