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/useAiChatMessageActions.tsx

@@ -6,7 +6,7 @@ import { App } from 'antd';
 import type { UploadFile, UploadProps } from 'antd';
 import { message } from '../../ui/app-message';
 import { useSettingsStore } from '../../store/settings/settingsStore';
-import { aiChatApi, resolveImportPreflight, type ResolveImportPreflightInput } from './api';
+import { aiChatApi } from './api';
 import { AiMessageContent } from './AiMessageContent';
 import { mapHistoryMessage } from './message-mappers';
 import { GongxueAiChatProvider } from './provider';
@@ -25,7 +25,6 @@ import type {
   AiChatMessage,
   AiChatMessageStatus,
   AiFormSchema,
-  AiImportPreflight,
   AiReviewSchema,
   AiReviewSection,
   AiReviewSectionType,
@@ -416,31 +415,6 @@ export function useAiChatMessageActions({
     [provider, setMessage],
   );
 
-  const resolvePreflight = useCallback(
-    async (
-      messageId: number | undefined,
-      _preflight: AiImportPreflight,
-      input: ResolveImportPreflightInput,
-    ): Promise<void> => {
-      if (typeof messageId !== 'number') {
-        throw new Error('消息尚未完成生成，请稍后再试');
-      }
-      await resolveImportPreflight(messageId, input, (update) => {
-        setMessage(messageId, (info) => ({
-          message: {
-            ...info.message,
-            metadata: {
-              ...info.message.metadata,
-              ...(update.preflight ? { a2uiImportPreflight: update.preflight } : {}),
-              ...(update.wizard ? { a2uiImportWizard: update.wizard } : {}),
-            },
-          },
-        }));
-      });
-    },
-    [setMessage],
-  );
-
   const customUpload = useCallback<NonNullable<UploadProps['customRequest']>>(async (options) => {
     const file = options.file as File;
     if (attachmentsRef.current.length >= 5) {
@@ -556,7 +530,6 @@ export function useAiChatMessageActions({
             onConfirmReviewStep={confirmReviewStep}
             onConfirmReviewGroup={confirmReviewGroup}
             onOpenImportWizard={setImportWizardRunId}
-            onResolveImportPreflight={resolvePreflight}
           />
         ),
       })),
@@ -570,7 +543,6 @@ export function useAiChatMessageActions({
       isRequesting,
       messages,
       reloadMessage,
-      resolvePreflight,
       setImportWizardRunId,
       submitForm,
       submitReview,