feat(ai): 移除 Excel 导入预检链路

- 删除 preflight_import 工具、预检卡、resolve 接口与 ui.import_preflight 事件
- 删除 imports.preflight 解析器与 PreflightReport 类型
- SYSTEM_PROMPT 改为上传 Excel 后直接确认列映射/策略并调用 start_import_wizard
- 前端同步移除预检类型/组件/测试，保留导入向导

apps/admin/src/components/AiChat/AiMessageContent.tsx

@@ -16,17 +16,14 @@ import { useUserStore } from '../../store/user/userStore';
 import { DynamicChart } from './DynamicChart';
 import { DynamicForm } from './DynamicForm';
 import { DynamicReview } from './DynamicReview';
-import { ImportPreflightCard } from './ImportPreflightCard';
 import { LiteCodeHighlighter } from './LiteCodeHighlighter';
 import { LiteMermaid } from './LiteMermaid';
-import type { ResolveImportPreflightInput } from './api';
 import type {
   AiAttachment,
   AiChatMessage,
   AiChatMessageStatus,
   AiChartSchema,
   AiFormSchema,
-  AiImportPreflight,
   AiImportWizard,
   AiReviewSection,
   AiReviewSchema,
@@ -46,7 +43,6 @@ const toolLabels: Record<string, string> = {
   render_form: '生成表单',
   render_review: '生成导入预览',
   render_chart: '生成图表',
-  preflight_import: '导入预检',
   start_import_wizard: '生成导入向导',
   create_student: '创建学生',
   search_exams: '查询考试',
@@ -193,11 +189,6 @@ export interface AiMessageContentProps {
     type: AiReviewSectionType,
   ) => AiReviewSchema | Promise<AiReviewSchema> | void;
   onOpenImportWizard?: (runId: string) => void;
-  onResolveImportPreflight?: (
-    messageId: number | undefined,
-    preflight: AiImportPreflight,
-    input: ResolveImportPreflightInput,
-  ) => Promise<void> | void;
 }
 
 export const AiMessageContent: React.FC<AiMessageContentProps> = ({
@@ -211,7 +202,6 @@ export const AiMessageContent: React.FC<AiMessageContentProps> = ({
   onConfirmReviewStep,
   onConfirmReviewGroup,
   onOpenImportWizard,
-  onResolveImportPreflight,
 }) => {
   const streaming = status === 'loading' || status === 'updating';
   const formSubmission = message.metadata?.a2uiSubmit;
@@ -324,26 +314,6 @@ export const AiMessageContent: React.FC<AiMessageContentProps> = ({
           {attachmentCards}
         </Flex>
       )}
-      {(() => {
-        const preflight = message.metadata?.a2uiImportPreflight;
-        if (!preflight || typeof preflight !== 'object' || Array.isArray(preflight)) return null;
-        const typedPreflight = preflight as AiImportPreflight;
-        return (
-          <ImportPreflightCard
-            preflight={typedPreflight}
-            onResolve={
-              onResolveImportPreflight
-                ? (input) =>
-                    onResolveImportPreflight(
-                      typeof message.id === 'number' ? message.id : undefined,
-                      typedPreflight,
-                      input,
-                    )
-                : undefined
-            }
-          />
-        );
-      })()}
       {(() => {
         const wizard = message.metadata?.a2uiImportWizard as AiImportWizard | undefined;
         if (!wizard || !onOpenImportWizard) return null;