修复: B-03b-R6 human_node send 缺 await + R7 前端契约失配（P0 审批链断裂）

R6: human_node.rs:41 发 HumanApprovalRequest 缺 .await（async fn send 的 Future 被 let _ = 丢弃未 poll，Request 从未进 channel，审批链最上游断裂，B-03a 重写引入，7 单测不覆盖 Request 发出故漏）
R7: project.ts:214 type 'HumanApprovalRequest'→'human_approval_request'(serde rename snake_case) + :215 payload.event.data→payload.event 扁平取字段(WorkflowEvent 无 data 包装)
来源: workflow-approval-review-2026-06-14.md §0/§1(31-agent 审查头号 P0)；cargo/vue-tsc 0 err / df-nodes 14 test pass

src/stores/project.ts

@@ -211,8 +211,9 @@ function createStore() {
       try {
         state.liveEvents.push(payload)
         // 处理人工审批请求
-        if (payload.event?.type === 'HumanApprovalRequest') {
-          state.pendingApproval = payload.event.data as typeof state.pendingApproval
+        // WorkflowEvent serde tag=type rename_all=snake_case → type='human_approval_request'，字段扁平(无 data 包装)(B-03b-R7)
+        if (payload.event?.type === 'human_approval_request') {
+          state.pendingApproval = payload.event as unknown as typeof state.pendingApproval
         }
       } catch (e) {
         console.error('处理工作流事件失败:', e, payload)