feat(ai): 业务上下文感知与 A2UI 链路统一

- 新增代码内业务上下文元数据层（实体字典 + 三大闭环工作流）
- 新增 get_business_context / get_entity_schema / get_pending_tasks 运行时工具
- SYSTEM_PROMPT 与技能目录改为先查业务流程/待办再执行
- A2UI 增加 ai_a2ui_submissions 幂等表、表单过期、ui.artifact 事件
- 提交回灌携带 submissionId / fieldErrors / 下一步建议
- 前端 uiArtifacts 归一化与过期表单禁用

apps/admin/src/components/AiChat/message-mappers.integration.test.ts

@@ -78,6 +78,52 @@ describe('AI chat history mapper', () => {
     expect(mapped.message.forms?.[0]).toMatchObject({ id: 'form-9', title: '新增学生' });
   });
 
+  it('restores uiArtifacts from message metadata and derives legacy lists', () => {
+    const mapped = mapHistoryMessage({
+      id: 8,
+      role: 'assistant',
+      content: '请处理',
+      reasoningContent: null,
+      status: 'completed',
+      errorCode: null,
+      createdAt: '2026-07-23T00:00:00.000Z',
+      metadata: {
+        uiArtifacts: [
+          {
+            id: 'form-10',
+            type: 'form',
+            status: 'submitted',
+            messageId: 8,
+            conversationId: 3,
+            payload: {
+              id: 'form-10',
+              title: '新增学生',
+              status: 'submitted',
+              fields: [],
+            },
+          },
+          {
+            id: 'review-10',
+            type: 'review',
+            status: 'expired',
+            messageId: 8,
+            conversationId: 3,
+            payload: {
+              id: 'review-10',
+              title: '旧预览',
+              status: 'expired',
+              sections: [],
+            },
+          },
+        ],
+      },
+    });
+
+    expect(mapped.message.uiArtifacts).toHaveLength(2);
+    expect(mapped.message.forms?.[0]).toMatchObject({ id: 'form-10', status: 'submitted' });
+    expect(mapped.message.reviews?.[0]).toMatchObject({ id: 'review-10', status: 'expired' });
+  });
+
   it('restores a persisted A2UI review from message metadata', () => {
     const mapped = mapHistoryMessage({
       id: 6,