feat: 小财管家意图规划与报销提交编排增强

- 完善管家意图识别、模型计划构建与规划器调度
- 重构差旅报销提交编排器与管家计划流程前端交互
- 优化报销消息项样式与文档中心视图
- 新增小财管家与附件上传风险前置复核设计文档
- 补充管家规划器与文档中心测试覆盖

web/src/assets/styles/views/travel-reimbursement-create-view-part4.css

@@ -141,6 +141,42 @@
   padding: 3px 7px;
 }
 
+.steward-task-missing {
+  margin-top: 9px;
+  padding-top: 9px;
+  border-top: 1px dashed #d5e2ee;
+  display: grid;
+  gap: 6px;
+}
+
+.steward-task-missing-label {
+  color: #5d7489;
+  font-size: 12px;
+  font-weight: 780;
+}
+
+.steward-task-missing-chip {
+  display: grid;
+  gap: 2px;
+  padding: 7px 8px;
+  border: 1px solid #e1e8f0;
+  border-radius: 4px;
+  background: #ffffff;
+}
+
+.steward-task-missing-chip strong {
+  color: #1f3448;
+  font-size: 12px;
+  font-weight: 820;
+  line-height: 1.35;
+}
+
+.steward-task-missing-chip small {
+  color: #6b7f92;
+  font-size: 11px;
+  line-height: 1.45;
+}
+
 .steward-attachment-chip.include {
   border-color: #c7deef;
   background: #eef7fc;