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.ts

@@ -14,6 +14,7 @@ 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 { AiConversation, AiMessage, AiToolRun } from './entities';
@@ -66,6 +67,7 @@ export class AiChatService extends AiChatServiceBase {
     chartService: AiChartService,
     abilityFactory: CaslAbilityFactory,
     authorization: AuthorizationService,
+    a2uiSubmissions?: A2uiSubmissionsService,
     excelReader?: AiExcelReaderService,
     importsService?: ImportsService,
     opLog?: OperationLogsService,
@@ -84,6 +86,7 @@ export class AiChatService extends AiChatServiceBase {
       chartService,
       abilityFactory,
       authorization,
+      a2uiSubmissions,
       excelReader,
       importsService,
       opLog,