feat: 新增风险图谱算法与系统仪表盘及操作反馈体系

后端新增风险图谱算法模块、风险观察与反馈服务、规则 DSL
校验器和可解释性引擎，完善系统仪表盘和财务仪表盘统计，
优化 agent 运行和编排执行链路，清理旧开发文档，前端新增
系统趋势、负载热力图等多种仪表盘图表组件，完善操作反馈
对话框和工作台日期选择器，优化报销创建和审批详情交互，
补充单元测试覆盖。

web/src/assets/styles/components/personal-workbench.css

@@ -127,6 +127,8 @@
 .assistant-file-input { display: none; }
 
 .assistant-composer {
+  position: relative;
+  z-index: 5;
   display: grid;
   gap: 6px;
   min-height: var(--composer-min-height);
@@ -160,6 +162,32 @@
 
 .assistant-composer textarea:focus { outline: none; }
 
+.assistant-composer textarea[readonly] {
+  color: color-mix(in srgb, var(--workbench-ink) 72%, #ffffff);
+  cursor: progress;
+}
+
+.assistant-intent-status {
+  display: inline-flex;
+  align-items: center;
+  width: fit-content;
+  max-width: 100%;
+  min-height: 28px;
+  gap: 8px;
+  padding: 0 10px;
+  border: 1px solid rgba(var(--theme-primary-rgb, 58, 124, 165), 0.22);
+  border-radius: 4px;
+  background: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.08);
+  color: var(--workbench-primary-active);
+  font-size: 12px;
+  font-weight: 750;
+  line-height: 1.35;
+}
+
+.assistant-intent-status i {
+  font-size: 15px;
+}
+
 .composer-toolbar {
   display: flex;
   align-items: center;
@@ -167,7 +195,6 @@
 }
 
 .composer-icon-button,
-.composer-related-button,
 .composer-send-button {
   display: inline-flex;
   align-items: center;
@@ -185,16 +212,6 @@
   font-size: 19px;
 }
 
-.composer-related-button {
-  gap: 8px;
-  padding: 0 16px;
-  border: 1px solid var(--workbench-line);
-  background: var(--workbench-surface);
-  color: var(--workbench-text);
-  font-size: 14px;
-  font-weight: 700;
-}
-
 .composer-count {
   margin-left: auto;
   color: color-mix(in srgb, var(--workbench-muted) 75%, #ffffff);
@@ -691,8 +708,7 @@
 .todo-row:hover,
 .progress-row:hover,
 .quick-prompts button:hover,
-.composer-icon-button:hover,
-.composer-related-button:hover {
+.composer-icon-button:hover {
   border-color: rgba(var(--theme-primary-rgb, 58, 124, 165), 0.24);
   color: var(--workbench-primary-active);
 }