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/composables/workbenchAiMode/workbenchIntentActionPolicy.js

@@ -0,0 +1,23 @@
+const QUERY_CANDIDATE_ACTIONS = new Set(['delete', 'approve', 'reject', 'query'])
+
+export function resolveWorkbenchIntentActionRoute(frame = null) {
+  if (!frame) {
+    return { nextStep: 'pass_through' }
+  }
+  if (frame.safetyLevel === 'blocked') {
+    return { nextStep: 'blocked', reason: '高风险批量动作需要先选择具体单据。' }
+  }
+  if (frame.action === 'ask_policy') {
+    return { nextStep: 'pass_through' }
+  }
+  if (frame.targetMode === 'current_context' && frame.safetyLevel === 'confirm_required') {
+    return { nextStep: 'open_context_confirm' }
+  }
+  if (frame.targetMode === 'filtered_candidates' && QUERY_CANDIDATE_ACTIONS.has(frame.action)) {
+    return {
+      nextStep: 'query_candidates',
+      queryPrompt: frame.normalizedQuery || ''
+    }
+  }
+  return { nextStep: 'pass_through' }
+}