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.service-base.ts

@@ -12,6 +12,7 @@ import { AiChartService } from './ai-chart.service';
 import { AiExcelReaderService } from './ai-excel-reader.service';
 import { AiFormService } from './ai-form.service';
 import { AiReviewService } from './ai-review.service';
+import type { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
 import { AiModelStreamService } from './ai-model-stream.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import {
@@ -114,6 +115,7 @@ export abstract class AiChatServiceBase implements AiChatServiceContext {
     readonly chartService: AiChartService,
     readonly abilityFactory: CaslAbilityFactory,
     readonly authorization: AuthorizationService,
+    readonly a2uiSubmissions?: A2uiSubmissionsService,
     readonly excelReader?: AiExcelReaderService,
     readonly importsService?: ImportsService,
     readonly opLog?: OperationLogsService,
@@ -127,7 +129,12 @@ export abstract class AiChatServiceBase implements AiChatServiceContext {
     return a2uiReviewSubmitInfo(metadata);
   }
 
-  buildFormSubmitModelContent(submit: { title: string; values: Record<string, unknown> }): string {
+  buildFormSubmitModelContent(submit: {
+    title: string;
+    values: Record<string, unknown>;
+    submissionId?: string;
+    fieldErrors?: Array<{ field: string; message: string }>;
+  }): string {
     return buildFormSubmitModelContent(submit);
   }
 
@@ -135,6 +142,8 @@ export abstract class AiChatServiceBase implements AiChatServiceContext {
     reviewId: string;
     reviewTitle: string;
     resultMessage: string;
+    submissionId?: string;
+    nextSteps?: Array<{ key: string; label: string }>;
   }): string {
     return buildReviewSubmitModelContent(submit);
   }