Merge branch 'fix/account-filters-menu-missing-features'

## Summary
- 修复账号管理页面组件拆分时遗漏的功能
- 统一所有内联 SVG 为 Icon 组件
- 修复 ProxySelector 选择"无代理"时发送错误值的问题

## Changes
- AccountTableFilters: 添加 Antigravity 平台选项、类型筛选器、inactive 状态
- AccountActionMenu: 恢复重置状态和清除限速按钮
- AccountsView: 修正 handleClearRateLimit 调用正确的 API
- ProxySelector: 修复选择"无代理"时发送 null 而不是 0

## Conflict Resolution
- ProxySelector.vue: 采用 PR 分支的正确逻辑（发送 null 而不是 0）
  这是正确的修复，因为后端使用 *int64 类型，nil 会触发 ClearProxyID()

frontend/src/views/user/ProfileView.vue

@@ -9,7 +9,7 @@
       <ProfileInfoCard :user="user" />
       <div v-if="contactInfo" class="card border-primary-200 bg-primary-50 dark:bg-primary-900/20 p-6">
         <div class="flex items-center gap-4">
-          <div class="p-3 bg-primary-100 rounded-xl text-primary-600">💬</div>
+          <div class="p-3 bg-primary-100 rounded-xl text-primary-600"><Icon name="chat" size="lg" /></div>
           <div><h3 class="font-semibold text-primary-800 dark:text-primary-200">{{ t('common.contactSupport') }}</h3><p class="text-sm font-medium">{{ contactInfo }}</p></div>
         </div>
       </div>
@@ -27,6 +27,7 @@ import StatCard from '@/components/common/StatCard.vue'
 import ProfileInfoCard from '@/components/user/profile/ProfileInfoCard.vue'
 import ProfileEditForm from '@/components/user/profile/ProfileEditForm.vue'
 import ProfilePasswordForm from '@/components/user/profile/ProfilePasswordForm.vue'
+import { Icon } from '@/components/icons'
 
 const { t } = useI18n(); const authStore = useAuthStore(); const user = computed(() => authStore.user)
 const contactInfo = ref('')

frontend/src/views/user/SubscriptionsView.vue

@@ -13,19 +13,7 @@
         <div
           class="mx-auto mb-4 flex h-16 w-16 items-center justify-center rounded-full bg-gray-100 dark:bg-dark-700"
         >
-          <svg
-            class="h-8 w-8 text-gray-400"
-            fill="none"
-            viewBox="0 0 24 24"
-            stroke="currentColor"
-            stroke-width="1.5"
-          >
-            <path
-              stroke-linecap="round"
-              stroke-linejoin="round"
-              d="M2.25 8.25h19.5M2.25 9h19.5m-16.5 5.25h6m-6 2.25h3m-3.75 3h15a2.25 2.25 0 002.25-2.25V6.75A2.25 2.25 0 0019.5 4.5h-15a2.25 2.25 0 00-2.25 2.25v10.5A2.25 2.25 0 004.5 19.5z"
-            />
-          </svg>
+          <Icon name="creditCard" size="xl" class="text-gray-400" />
         </div>
         <h3 class="mb-2 text-lg font-semibold text-gray-900 dark:text-white">
           {{ t('userSubscriptions.noActiveSubscriptions') }}
@@ -50,19 +38,7 @@
               <div
                 class="flex h-10 w-10 items-center justify-center rounded-xl bg-purple-100 dark:bg-purple-900/30"
               >
-                <svg
-                  class="h-5 w-5 text-purple-600 dark:text-purple-400"
-                  fill="none"
-                  viewBox="0 0 24 24"
-                  stroke="currentColor"
-                  stroke-width="1.5"
-                >
-                  <path
-                    stroke-linecap="round"
-                    stroke-linejoin="round"
-                    d="M2.25 8.25h19.5M2.25 9h19.5m-16.5 5.25h6m-6 2.25h3m-3.75 3h15a2.25 2.25 0 002.25-2.25V6.75A2.25 2.25 0 0019.5 4.5h-15a2.25 2.25 0 00-2.25 2.25v10.5A2.25 2.25 0 004.5 19.5z"
-                  />
-                </svg>
+                <Icon name="creditCard" size="md" class="text-purple-600 dark:text-purple-400" />
               </div>
               <div>
                 <h3 class="font-semibold text-gray-900 dark:text-white">
@@ -265,6 +241,7 @@ import { useAppStore } from '@/stores/app'
 import subscriptionsAPI from '@/api/subscriptions'
 import type { UserSubscription } from '@/types'
 import AppLayout from '@/components/layout/AppLayout.vue'
+import Icon from '@/components/icons/Icon.vue'
 import { formatDateOnly } from '@/utils/format'
 
 const { t } = useI18n()