修复 UI 编辑器导入提交与恢复边界

为图片和远程素材导入增加服务端数量、单文件及批次总量上限

改为提交成功后推进项目 revision，并保留 reconciliation-required 结果

远程 IPC 改传签名地址并流式限量下载，UI State 使用稳定 previous 恢复副本

apps/ai-game-creator-shell/src/components/AssetImporter/index.tsx

@@ -8,7 +8,7 @@ import { useCallback, useEffect, useRef, useState } from 'react';
 
 import {
   loadEditorAssetLibrary,
-  readClientAssetBytes,
+  resolveClientAssetReadUrl,
 } from '../../services/clientApi';
 import { ThemedModal } from '../modal/ThemedModal';
 import {
@@ -223,8 +223,9 @@ export function AssetImporter({
       });
       const sourcePaths = Array.isArray(paths) ? paths : paths ? [paths] : [];
       if (!sourcePaths.length) return;
-      if (sourcePaths.length > maxItems)
+      if (sourcePaths.length > maxItems) {
         throw new Error(`最多选择 ${maxItems} 个文件`);
+      }
       const result = await invoke<GenericImportResponse>(
         'import_ui_editor_assets',
         {
@@ -271,18 +272,13 @@ export function AssetImporter({
               remoteAssets: await Promise.all(
                 remoteChosen.map(async (item) => {
                   const asset = item.asset!;
-                  const response = asset.localPath.startsWith('http')
-                    ? await fetch(asset.localPath)
-                    : await readClientAssetBytes(asset.localPath);
-                  if (!response.ok)
-                    throw new Error(
-                      `读取平台素材失败（HTTP ${response.status}）`,
-                    );
-                  const bytes = new Uint8Array(await response.arrayBuffer());
+                  const downloadUrl = asset.localPath.startsWith('http')
+                    ? asset.localPath
+                    : await resolveClientAssetReadUrl(asset.localPath);
                   return {
                     assetId: asset.id,
                     objectKey: asset.localPath,
-                    bytes: Array.from(bytes),
+                    downloadUrl,
                   };
                 }),
               ),