feat(asl): Week 2 Day 2 - Excel import with template download and intelligent dedup

Features:
- feat: Excel template generation and download (with examples)
- feat: Excel file parsing in memory (cloud-native, no disk write)
- feat: Field validation (title + abstract required)
- feat: Smart deduplication (DOI priority + Title fallback)
- feat: Literature preview table with statistics
- feat: Complete submission flow (create project + import literatures)

Components:
- feat: Create excelUtils.ts with full Excel processing toolkit
- feat: Enhance TitleScreeningSettings page with upload/preview/submit
- feat: Update API interface signatures and export unified aslApi object

Dependencies:
- chore: Add xlsx library for Excel file processing

Ref: Week 2 Frontend Development - Day 2
Scope: ASL Module MVP - Title Abstract Screening
Cloud-Native: Memory parsing, no file persistence

frontend-v2/src/modules/asl/api/index.ts

@@ -101,15 +101,13 @@ export async function deleteProject(
 /**
  * 批量导入文献（JSON格式）
  */
-export async function importLiteratures(
-  projectId: string,
-  data: ImportLiteraturesRequest
-): Promise<ApiResponse<{
-  imported: number;
-  duplicates: number;
-  failed: number;
+export async function importLiteratures(data: {
+  projectId: string;
+  literatures: Array<Omit<Literature, 'id' | 'projectId' | 'createdAt'>>;
+}): Promise<ApiResponse<{
+  importedCount: number;
 }>> {
-  return request(`/projects/${projectId}/literatures/import-json`, {
+  return request('/literatures/import', {
     method: 'POST',
     body: JSON.stringify(data),
   });
@@ -265,3 +263,39 @@ export async function healthCheck(): Promise<ApiResponse<{
   return request('/health');
 }
 
+// ==================== 统一导出API对象 ====================
+
+/**
+ * ASL API统一导出对象
+ */
+export const aslApi = {
+  // 项目管理
+  createProject,
+  listProjects,
+  getProject,
+  updateProject,
+  deleteProject,
+  
+  // 文献管理
+  importLiteratures,
+  listLiteratures,
+  deleteLiterature,
+  
+  // 筛选任务
+  startScreening,
+  getTaskProgress,
+  
+  // 筛选结果
+  getScreeningResults,
+  updateScreeningResult,
+  batchUpdateScreeningResults,
+  
+  // 导出
+  exportScreeningResults,
+  
+  // 统计
+  getProjectStatistics,
+  
+  // 健康检查
+  healthCheck,
+};