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.tools.ts

@@ -2,8 +2,6 @@ import { AgentToolContextFactory } from '../agent-tools/agent-tool.types';
 import type { AiChatServiceContext, AiSseEmitter, ModelToolCall } from './ai-chat.types';
 import type { AiToolRun } from './entities';
 import {
-  executeOfficeAnalyze,
-  executeExcelAnalyze,
   executePreflightImport,
   executeRenderChart,
   executeRenderForm,
@@ -95,9 +93,6 @@ export async function executeTool(
   if (call.name === 'preflight_import') {
     return executePreflightImport(context, messageId, call, userId, emit);
   }
-  if (call.name === 'excel_analyze') {
-    return executeExcelAnalyze(context, messageId, call, userId, emit);
-  }
   if (call.name === 'start_import_wizard') {
     return executeStartImportWizard(context, messageId, call, agentContext, emit);
   }
@@ -110,9 +105,6 @@ export async function executeTool(
   if (call.name === 'render_chart') {
     return executeRenderChart(context, messageId, call, emit);
   }
-  if (call.name === 'office_analyze') {
-    return executeOfficeAnalyze(context, messageId, call, userId, emit);
-  }
   if ((call.name === 'create_student' || call.name === 'update_students') && !allowWriteTools) {
     return denyWriteTool(context, messageId, call, emit);
   }