feat: 新增风险规则生成引擎与知识图谱可视化

后端新增风险规则自动生成和模板执行服务，支持从规则资产
批量生成并持久化风险规则文件；知识库入库日志增强图谱
查询和本地 RAG 回退，前端审计页面增加风险规则模型和流
程图组件，知识入库面板拆分为图谱可视化子组件，报销创
建页面增加引导式流程模型，更新知识库索引数据。

web/src/assets/styles/views/audit-view.css

@@ -555,20 +555,33 @@ tbody tr:hover {
   background: rgba(16, 185, 129, 0.08);
 }
 
-.detail-scroll {
-  height: 100%;
-  overflow: auto;
-  display: grid;
-  align-content: start;
-  gap: 16px;
-}
-
-.spreadsheet-skill-detail .detail-scroll {
-  min-height: 0;
-  overflow: hidden;
-  align-content: stretch;
-  grid-template-rows: minmax(0, 1fr);
-}
+.detail-scroll {
+  height: 100%;
+  overflow: auto;
+  display: grid;
+  align-content: start;
+  gap: 16px;
+}
+
+.spreadsheet-skill-detail .detail-scroll {
+  min-height: 0;
+  overflow: hidden;
+  align-content: stretch;
+  grid-template-rows: minmax(0, 1fr);
+}
+
+.json-risk-skill-detail .detail-scroll {
+  min-height: 0;
+  overflow: hidden;
+  align-content: stretch;
+  grid-template-rows: minmax(0, 1fr);
+}
+
+.detail-loading-state {
+  width: 100%;
+  min-height: 260px;
+  align-self: center;
+}
 
 .detail-hero {
   display: grid;