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

frontend/src/components/ui/sidebar/SidebarContent.vue

@@ -1,14 +1,57 @@
 <script setup lang="ts">
 import type { HTMLAttributes } from "vue"
 import { cn } from "@/lib/utils"
+import { ref, onMounted, onUnmounted, nextTick } from "vue"
 
 const props = defineProps<{
   class?: HTMLAttributes["class"]
 }>()
+
+const scrollRef = ref<HTMLElement | null>(null)
+const scrollPositionKey = 'sidebar-scroll-position'
+let saveTimeout: ReturnType<typeof setTimeout> | null = null
+
+function saveScrollPosition() {
+  if (scrollRef.value) {
+    sessionStorage.setItem(scrollPositionKey, scrollRef.value.scrollTop.toString())
+  }
+}
+
+function handleScroll() {
+  if (saveTimeout) {
+    clearTimeout(saveTimeout)
+  }
+  saveTimeout = setTimeout(saveScrollPosition, 50)
+}
+
+onMounted(() => {
+  const saved = sessionStorage.getItem(scrollPositionKey)
+  if (saved) {
+    nextTick(() => {
+      if (scrollRef.value) {
+        scrollRef.value.scrollTop = parseFloat(saved)
+      }
+    })
+  }
+  
+  if (scrollRef.value) {
+    scrollRef.value.addEventListener('scroll', handleScroll, { passive: true })
+  }
+})
+
+onUnmounted(() => {
+  if (scrollRef.value) {
+    scrollRef.value.removeEventListener('scroll', handleScroll)
+  }
+  if (saveTimeout) {
+    clearTimeout(saveTimeout)
+  }
+})
 </script>
 
 <template>
   <div
+    ref="scrollRef"
     data-slot="sidebar-content"
     data-sidebar="content"
     :class="cn('flex min-h-0 flex-1 flex-col gap-2 overflow-auto group-data-[collapsible=icon]:overflow-hidden', props.class)"