feat: regenerate dependent versions after deletion

- Add RegenerateFullPackage function to rebuild single version's full package
- Add RegenerateDependentVersions function to handle cascade regeneration
- Call regeneration after deleting versions
- Each version maintains its own full package independently

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/internal/router/admin/versions.go

@@ -571,6 +571,11 @@ func handleBatchDeleteVersions(c *gin.Context) {
 		return
 	}
 
+	// 删除后重新生成依赖这些版本的后续版本
+	for _, id := range req.IDs {
+		RegenerateDependentVersions(id)
+	}
+
 	response.Success(c, nil)
 }