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/server/src/ai-chat/ai-chat.submit-content.spec.ts

@@ -0,0 +1,66 @@
+import { describe, expect, it } from '@jest/globals';
+import {
+  a2uiReviewSubmitInfo,
+  a2uiSubmitInfo,
+  buildFormSubmitModelContent,
+  buildReviewSubmitModelContent,
+} from './ai-chat.submit-content';
+
+describe('a2ui submit model content', () => {
+  it('表单提交信息解析 submissionId 与 fieldErrors', () => {
+    const info = a2uiSubmitInfo({
+      a2uiSubmit: {
+        formId: 'form-1',
+        formTitle: '新增学生',
+        values: { name: '张三' },
+        submissionId: 'sub-1',
+        fieldErrors: [{ field: 'phone', message: '手机号格式错误' }],
+      },
+    });
+    expect(info).toEqual({
+      formId: 'form-1',
+      title: '新增学生',
+      values: { name: '张三' },
+      submissionId: 'sub-1',
+      fieldErrors: [{ field: 'phone', message: '手机号格式错误' }],
+    });
+  });
+
+  it('表单回灌内容包含提交 ID 与结构化错误', () => {
+    const content = buildFormSubmitModelContent({
+      title: '新增学生',
+      values: { name: '张三' },
+      submissionId: 'sub-1',
+      fieldErrors: [],
+    });
+    expect(content).toContain('sub-1');
+    expect(content).toContain('"name":"张三"');
+    expect(content).toContain('fieldErrors');
+  });
+
+  it('审阅提交信息解析 submissionId 与下一步建议', () => {
+    const info = a2uiReviewSubmitInfo({
+      a2uiReviewSubmit: {
+        reviewId: 'review-1',
+        reviewTitle: '批量入住导入',
+        resultMessage: '已导入 12 条',
+        submissionId: 'sub-2',
+        nextSteps: [{ key: 'after_checkin', label: '入住完成 → 建议录入费用' }],
+      },
+    });
+    expect(info?.submissionId).toBe('sub-2');
+    expect(info?.nextSteps).toHaveLength(1);
+  });
+
+  it('审阅回灌内容包含提交 ID 与下一步建议', () => {
+    const content = buildReviewSubmitModelContent({
+      reviewId: 'review-1',
+      reviewTitle: '批量入住导入',
+      resultMessage: '已导入 12 条',
+      submissionId: 'sub-2',
+      nextSteps: [{ key: 'after_checkin', label: '入住完成 → 建议录入费用' }],
+    });
+    expect(content).toContain('sub-2');
+    expect(content).toContain('建议录入费用');
+  });
+});