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/tests/travel-reimbursement-composer-tools.test.mjs

@@ -38,3 +38,8 @@ test('composer keeps backend raw text but displays structured user message', ()
   assert.match(submitComposerScript, /const rawText = resolveComposerSubmitText\(options\.rawText\)\.trim\(\)/)
   assert.match(submitComposerScript, /resolveComposerDisplaySubmitText\(rawText\)/)
 })
+
+test('knowledge questions keep enough request time for LightRAG retrieval', () => {
+  assert.match(submitComposerScript, /timeoutMs:\s*75000/)
+  assert.match(submitComposerScript, /知识问答仍在检索整理/)
+})