feat(web): AI 工作台命令意图解析与动作策略

- 新增 workbenchIntentFrameModel，解析删除/审批/查询/咨询政策等意图帧，含风险等级、目标模式（当前上下文/筛选候选）与日期归一化
- 新增 workbenchIntentActionPolicy，按意图帧路由下一步（直通/拦截批量/上下文确认/查询候选）
- 新增 workbenchAiCommandIntentModel 与 useWorkbenchAiCommandIntents，识别草稿删除意图并解析最近草稿载荷生成引导
- usePersonalWorkbenchAiMode 接入命令意图处理，personal-workbench-ai-mode.css 适配
- 新增 command-intent-model/intent-frame-model 测试

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

@@ -1450,6 +1450,31 @@
   font-weight: 900;
 }
 
+.workbench-ai-answer-markdown :deep(.ai-document-command-guidance) {
+  display: grid;
+  gap: 6px;
+  margin: 0 0 14px;
+  padding: 13px 15px;
+  border: 1px solid rgba(245, 158, 11, 0.28);
+  border-radius: 12px;
+  background: rgba(255, 251, 235, 0.82);
+  color: #78350f;
+}
+
+.workbench-ai-answer-markdown :deep(.ai-document-command-guidance__title) {
+  color: #92400e;
+  font-size: 14px;
+  font-weight: 860;
+  line-height: 1.35;
+}
+
+.workbench-ai-answer-markdown :deep(.ai-document-command-guidance__body) {
+  color: #78350f;
+  font-size: 13px;
+  font-weight: 680;
+  line-height: 1.6;
+}
+
 .workbench-ai-answer-markdown :deep(.ai-document-card-list) {
   display: grid;
   gap: 16px;