refactor: 清理IndexedDB相关代码，统一使用后端ZIP存储

- 移除前端废弃的loadZipFile/saveZipFile函数
- ProjectDetail使用scanStoredZipFile替代loadZipFile
- RecycleBin移除手动删除ZIP文件逻辑
- 后端permanently_delete_project自动清理ZIP文件

backend/app/api/v1/endpoints/projects.py

@@ -294,6 +294,14 @@ async def permanently_delete_project(
     if project.owner_id != current_user.id:
         raise HTTPException(status_code=403, detail="无权永久删除此项目")
     
+    # 如果是ZIP类型项目，删除关联的ZIP文件和元数据
+    if project.source_type == "zip":
+        try:
+            await delete_project_zip(id)
+            print(f"[Project] 已删除项目 {id} 的ZIP文件")
+        except Exception as e:
+            print(f"[Warning] 删除ZIP文件失败: {e}")
+    
     await db.delete(project)
     await db.commit()
     return {"message": "项目已永久删除"}

frontend/src/pages/ProjectDetail.tsx

@@ -25,9 +25,9 @@ import {
   GitBranch
 } from "lucide-react";
 import { api } from "@/shared/config/database";
-import { runRepositoryAudit, scanZipFile } from "@/features/projects/services";
+import { runRepositoryAudit, scanStoredZipFile } from "@/features/projects/services";
 import type { Project, AuditTask, CreateProjectForm } from "@/shared/types";
-import { loadZipFile } from "@/shared/utils/zipStorage";
+import { hasZipFile } from "@/shared/utils/zipStorage";
 import { isRepositoryProject, getSourceTypeLabel } from "@/shared/utils/projectUtils";
 import { toast } from "sonner";
 import CreateTaskDialog from "@/components/audit/CreateTaskDialog";
@@ -173,18 +173,17 @@ export default function ProjectDetail() {
         setScanning(false);
       }
     } else {
-      // 没有仓库地址，尝试从IndexedDB加载保存的ZIP文件
+      // 没有仓库地址，尝试使用后端存储的ZIP文件
       try {
         setScanning(true);
-        const file = await loadZipFile(id);
+        const hasFile = await hasZipFile(id);
 
-        if (file) {
-          console.log('找到保存的ZIP文件，开始启动审计...');
+        if (hasFile) {
+          console.log('找到后端存储的ZIP文件，开始启动审计...');
           try {
-            // 启动ZIP文件审计
-            const taskId = await scanZipFile({
+            // 使用后端存储的ZIP文件启动审计
+            const taskId = await scanStoredZipFile({
               projectId: id,
-              zipFile: file,
               excludePatterns: ['node_modules/**', '.git/**', 'dist/**', 'build/**'],
               createdBy: 'local-user'
             });
@@ -206,7 +205,6 @@ export default function ProjectDetail() {
         } else {
           setScanning(false);
           toast.warning('此项目未配置仓库地址，也未上传ZIP文件。请先在项目设置中配置仓库地址，或通过"新建任务"上传ZIP文件。');
-          // 不自动打开对话框，让用户自己选择
         }
       } catch (error) {
         console.error('启动审计失败:', error);

frontend/src/pages/RecycleBin.tsx

@@ -18,7 +18,6 @@ import {
 import { api } from "@/shared/config/database";
 import type { Project } from "@/shared/types";
 import { toast } from "sonner";
-import { deleteZipFile } from "@/shared/utils/zipStorage";
 import { isRepositoryProject, getSourceTypeBadge } from "@/shared/utils/projectUtils";
 
 export default function RecycleBin() {
@@ -75,16 +74,9 @@ export default function RecycleBin() {
     if (!selectedProject) return;
 
     try {
-      // 删除项目数据
+      // 删除项目数据（后端会同时删除关联的ZIP文件）
       await api.permanentlyDeleteProject(selectedProject.id);
 
-      // 删除保存的ZIP文件（如果有）
-      try {
-        await deleteZipFile(selectedProject.id);
-      } catch (error) {
-        console.error('删除ZIP文件失败:', error);
-      }
-
       toast.success(`项目 "${selectedProject.name}" 已永久删除`);
       setShowPermanentDeleteDialog(false);
       setSelectedProject(null);

frontend/src/shared/utils/zipStorage.ts

@@ -91,29 +91,4 @@ export function formatFileSize(bytes: number): string {
   return `${bytes} B`;
 }
 
-// ============ 兼容旧API（已废弃，保留以避免编译错误） ============
 
-/**
- * @deprecated 使用 uploadZipFile 代替
- */
-export async function saveZipFile(projectId: string, file: File): Promise<void> {
-  const result = await uploadZipFile(projectId, file);
-  if (!result.success) {
-    throw new Error(result.message || '保存ZIP文件失败');
-  }
-}
-
-/**
- * @deprecated 使用 getZipFileInfo 代替
- */
-export async function loadZipFile(projectId: string): Promise<File | null> {
-  // 后端不再返回文件内容，只返回元数据
-  // 如果需要文件，应该在创建任务时直接使用后端存储的文件
-  const info = await getZipFileInfo(projectId);
-  if (info.has_file && info.original_filename) {
-    // 返回一个虚拟的File对象，仅包含元数据
-    const blob = new Blob([], { type: 'application/zip' });
-    return new File([blob], info.original_filename, { type: 'application/zip' });
-  }
-  return null;
-}