feat(health+workflow): 行动分发→工作流启动集成 — 事件驱动 BPMN 实例化

- create_pending_action 新增 workflow.ai_action.start_requested 事件发布
- 根据 action_type 映射到对应 BPMN 流程定义 key
- erp-workflow 消费启动请求，自动创建审批流程实例
- 流程变量包含 risk_level/patient_id/action_type/params

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

@@ -136,6 +136,7 @@ async fn create_pending_action(
     risk_level: &str,
     decision: &DispatchDecision,
 ) {
+    // 发布待审批事件（通知/日志用）
     let event = erp_core::events::DomainEvent::new(
         "health.ai_action.pending_approval",
         tenant_id,
@@ -149,6 +150,28 @@ async fn create_pending_action(
         })),
     );
     event_bus.publish(event, db).await;
+
+    // 发布工作流启动请求事件（触发 BPMN 审批流程）
+    let workflow_key = match action_type {
+        "followup" => "ai_followup_workflow",
+        "appointment" => "ai_appointment_workflow",
+        "alert" => "ai_alert_workflow",
+        _ => return,
+    };
+
+    let workflow_event = erp_core::events::DomainEvent::new(
+        "workflow.ai_action.start_requested",
+        tenant_id,
+        erp_core::events::build_event_payload(serde_json::json!({
+            "workflow_key": workflow_key,
+            "patient_id": patient_id,
+            "doctor_id": doctor_id,
+            "risk_level": risk_level,
+            "action_type": action_type,
+            "params": params,
+        })),
+    );
+    event_bus.publish(workflow_event, db).await;
 }
 
 #[cfg(test)]