fix(ai): 修复 Nest DI 启动失败

- A2uiSubmissionsService/DataSource/BusinessContextService 等构造参数
  由 import type 改为值导入，确保 Nest 能解析依赖
- 验证：dev 模式后端正常启动，相关 243 个测试通过

apps/server/src/ai-chat/ai-chat.service-base.ts

@@ -12,7 +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 { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
 import { AiModelStreamService } from './ai-model-stream.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import {