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/scripts/translate_packages_i18n.go

@@ -1,4 +1,4 @@
-package main
+package main
 
 import (
 	"fmt"
@@ -18,15 +18,15 @@ func main() {
 	}{
 		"免费版": {
 			NameEn:        "Free",
-			DescriptionEn: "Basic features for individual developers",
+			DescriptionEn: "Basic features for individual admins",
 		},
 		"公益版": {
 			NameEn:        "Community",
-			DescriptionEn: "Free for individual developers",
+			DescriptionEn: "Free for individual admins",
 		},
 		"专业版": {
 			NameEn:        "Professional",
-			DescriptionEn: "Advanced features for professional developers",
+			DescriptionEn: "Advanced features for professional admins",
 		},
 		"企业版": {
 			NameEn:        "Enterprise",
@@ -46,7 +46,7 @@ func main() {
 		},
 		"开发者版": {
 			NameEn:        "Developer",
-			DescriptionEn: "Perfect for individual developers",
+			DescriptionEn: "Perfect for individual admins",
 		},
 		"团队版": {
 			NameEn:        "Team",