fix: 订阅模式登录验证、永久会员类型区分、动态代码HTTP返回值修复、侧边栏滚动位置保持

- 修复订阅模式登录时错误检查余额的问题
- 区分无限余额和永久订阅两种永久会员类型
- 修复动态代码HTTP请求返回值在JS中无法正确访问的问题
- 添加侧边栏滚动位置保持功能
- 移除developer角色相关代码，统一使用admin
- 添加缺失的i18n翻译key

backend/internal/router/app/cloud.go

@@ -549,18 +549,18 @@ func handleAppUploadVariableBinary(c *gin.Context) {
 	}
 	defer file.Close()
 
-	var developer model.User
-	if err := database.DB.First(&developer, app.UserID).Error; err != nil {
-		response.Error(c, 500, "获取开发者信息失败")
+	var adminUser model.User
+	if err := database.DB.First(&adminUser, app.UserID).Error; err != nil {
+		response.Error(c, 500, "获取管理员信息失败")
 		return
 	}
 
-	if developer.CurrentPackageID != nil {
+	if adminUser.CurrentPackageID != nil {
 		var permission model.PackagePermission
-		if err := database.DB.Where("package_id = ?", developer.CurrentPackageID).First(&permission).Error; err == nil {
+		if err := database.DB.Where("package_id = ?", adminUser.CurrentPackageID).First(&permission).Error; err == nil {
 			maxStorageBytes := int64(permission.MaxStorage) * 1024 * 1024
-			if developer.StorageUsed+header.Size > maxStorageBytes {
-				usedMB := float64(developer.StorageUsed) / 1024 / 1024
+			if adminUser.StorageUsed+header.Size > maxStorageBytes {
+				usedMB := float64(adminUser.StorageUsed) / 1024 / 1024
 				maxMB := float64(permission.MaxStorage)
 				response.Error(c, 403, fmt.Sprintf("存储空间不足，已使用 %.2f MB / %.2f MB", usedMB, maxMB))
 				return