refactor(ai-chat): 移除 excel_analyze/office_analyze 工具与 OfficeKit 依赖

- 删除 excel_analyze/office_analyze 两个 A2UI 工具（schema、分发、执行器、测试）
- 附件分析改为依赖上传时自动提取的文本与 preflight_import 报告 errorSamples
- 移除 @officecli/officecli 依赖及 OfficeCliService（PPT 上传不再自动提取文本）
- 保留 AiExcelReaderService（附件文本提取与导入预检仍使用）

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

@@ -15,7 +15,6 @@ import { AiExcelReaderService } from './ai-excel-reader.service';
 import { AiFormService } from './ai-form.service';
 import { AiReviewService } from './ai-review.service';
 import { AiModelStreamService } from './ai-model-stream.service';
-import { OfficeCliService } from './office-cli.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import {
   AiConversation,
@@ -74,7 +73,6 @@ import {
 } from './ai-chat.submissions';
 import { denyWriteTool, executeTool } from './ai-chat.tools';
 import {
-  executeExcelAnalyze,
   executePreflightImport,
   executeStartImportWizard,
 } from './ai-chat.tool-actions';
@@ -111,7 +109,6 @@ export class AiChatService implements AiChatServiceContext {
     readonly abilityFactory: CaslAbilityFactory,
     readonly authorization: AuthorizationService,
     readonly excelReader?: AiExcelReaderService,
-    readonly officeCli?: OfficeCliService,
     readonly importsService?: ImportsService,
     readonly opLog?: OperationLogsService,
   ) {}
@@ -306,15 +303,6 @@ export class AiChatService implements AiChatServiceContext {
     return executePreflightImport(this, messageId, call, userId, emit);
   }
 
-  executeExcelAnalyze(
-    messageId: number,
-    call: ModelToolCall,
-    userId: number,
-    emit: AiSseEmitter,
-  ): Promise<string> {
-    return executeExcelAnalyze(this, messageId, call, userId, emit);
-  }
-
   executeGeneration(input: GenerationInput): Promise<void> {
     return executeGeneration(this, input);
   }