feat(ui): 优化分组选择器交互体验

- 分组下拉添加搜索框，支持按名称/描述快速筛选
- 新建/编辑密钥弹窗的分组选择也支持搜索
- 智能弹出方向：底部空间不足时自动向上弹出
- 倍率独立为平台配色的圆角标签，更醒目
- 分组名称加粗，名称与描述之间增加间距
- 分组选项之间添加分隔线，视觉更清晰
- 切换图标旁增加"选择分组"文字提示
- 下拉宽度自适应内容长度
- i18n: 新增 searchGroup、noGroupFound 词条 (en/zh)

frontend/src/components/common/GroupOptionItem.vue

 <template>
-  <div class="flex min-w-0 flex-1 items-center justify-between gap-2">
+  <div class="flex min-w-0 flex-1 items-start justify-between gap-3">
+    <!-- Left: name + description -->
     <div
-      class="flex min-w-0 flex-1 flex-col items-start gap-1"
+      class="flex min-w-0 flex-1 flex-col items-start"
       :title="description || undefined"
     >
+      <!-- Row 1: platform badge (name bold) -->
       <GroupBadge
         :name="name"
         :platform="platform"
         :subscription-type="subscriptionType"
-        :rate-multiplier="rateMultiplier"
-        :user-rate-multiplier="userRateMultiplier"
+        :show-rate="false"
+        class="groupOptionItemBadge"
       />
+      <!-- Row 2: description with top spacing -->
       <span
         v-if="description"
-        class="w-full text-left text-xs text-gray-500 dark:text-gray-400 line-clamp-2"
+        class="mt-1.5 w-full text-left text-xs leading-relaxed text-gray-500 dark:text-gray-400 line-clamp-2"
       >
         {{ description }}
       </span>
     </div>
-    <svg
-      v-if="showCheckmark && selected"
-      class="h-4 w-4 shrink-0 text-primary-600 dark:text-primary-400"
-      fill="none"
-      stroke="currentColor"
-      viewBox="0 0 24 24"
-      stroke-width="2"
-    >
-      <path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" />
-    </svg>
+
+    <!-- Right: rate pill + checkmark (vertically centered to first row) -->
+    <div class="flex shrink-0 items-center gap-2 pt-0.5">
+      <!-- Rate pill (platform color) -->
+      <span v-if="rateMultiplier !== undefined" :class="['inline-flex items-center whitespace-nowrap rounded-full px-3 py-1 text-xs font-semibold', ratePillClass]">
+        <template v-if="hasCustomRate">
+          <span class="mr-1 line-through opacity-50">{{ rateMultiplier }}x</span>
+          <span class="font-bold">{{ userRateMultiplier }}x</span>
+        </template>
+        <template v-else>
+          {{ rateMultiplier }}x 倍率
+        </template>
+      </span>
+      <!-- Checkmark -->
+      <svg
+        v-if="showCheckmark && selected"
+        class="h-4 w-4 shrink-0 text-primary-600 dark:text-primary-400"
+        fill="none"
+        stroke="currentColor"
+        viewBox="0 0 24 24"
+        stroke-width="2"
+      >
+        <path stroke-linecap="round" stroke-linejoin="round" d="M5 13l4 4L19 7" />
+      </svg>
+    </div>
   </div>
 </template>
 
 <script setup lang="ts">
+import { computed } from 'vue'
 import GroupBadge from './GroupBadge.vue'
 import type { SubscriptionType, GroupPlatform } from '@/types'
 
@@ -46,10 +65,43 @@ interface Props {
   showCheckmark?: boolean
 }
 
-withDefaults(defineProps<Props>(), {
+const props = withDefaults(defineProps<Props>(), {
   subscriptionType: 'standard',
   selected: false,
   showCheckmark: true,
   userRateMultiplier: null
 })
+
+// Whether user has a custom rate different from default
+const hasCustomRate = computed(() => {
+  return (
+    props.userRateMultiplier !== null &&
+    props.userRateMultiplier !== undefined &&
+    props.rateMultiplier !== undefined &&
+    props.userRateMultiplier !== props.rateMultiplier
+  )
+})
+
+// Rate pill color matches platform badge color
+const ratePillClass = computed(() => {
+  switch (props.platform) {
+    case 'anthropic':
+      return 'bg-amber-50 text-amber-700 dark:bg-amber-900/20 dark:text-amber-400'
+    case 'openai':
+      return 'bg-green-50 text-green-700 dark:bg-green-900/20 dark:text-green-400'
+    case 'gemini':
+      return 'bg-sky-50 text-sky-700 dark:bg-sky-900/20 dark:text-sky-400'
+    case 'sora':
+      return 'bg-rose-50 text-rose-700 dark:bg-rose-900/20 dark:text-rose-400'
+    default: // antigravity and others
+      return 'bg-violet-50 text-violet-700 dark:bg-violet-900/20 dark:text-violet-400'
+  }
+})
 </script>
+
+<style scoped>
+/* Bold the group name inside GroupBadge when used in dropdown option */
+.groupOptionItemBadge :deep(span.truncate) {
+  font-weight: 600;
+}
+</style>

frontend/src/components/common/Select.vue

@@ -224,7 +224,13 @@ const filteredOptions = computed(() => {
   let opts = props.options as any[]
   if (props.searchable && searchQuery.value) {
     const query = searchQuery.value.toLowerCase()
-    opts = opts.filter((opt) => getOptionLabel(opt).toLowerCase().includes(query))
+    opts = opts.filter((opt) => {
+      // Match label
+      if (getOptionLabel(opt).toLowerCase().includes(query)) return true
+      // Also match description if present
+      if (opt.description && String(opt.description).toLowerCase().includes(query)) return true
+      return false
+    })
   }
   return opts
 })
@@ -434,7 +440,7 @@ onUnmounted(() => {
 
 <style>
 .select-dropdown-portal {
-  @apply w-max min-w-[200px] max-w-[480px];
+  @apply w-max min-w-[200px];
   @apply bg-white dark:bg-dark-800;
   @apply rounded-xl;
   @apply border border-gray-200 dark:border-dark-700;

frontend/src/i18n/locales/en.ts

@@ -536,6 +536,8 @@ export default {
     apiKey: 'API Key',
     group: 'Group',
     noGroup: 'No group',
+    searchGroup: 'Search groups...',
+    noGroupFound: 'No groups found',
     created: 'Created',
     copyToClipboard: 'Copy to clipboard',
     copied: 'Copied!',

frontend/src/i18n/locales/zh.ts

@@ -536,6 +536,8 @@ export default {
     apiKey: 'API 密钥',
     group: '分组',
     noGroup: '无分组',
+    searchGroup: '搜索分组...',
+    noGroupFound: '未找到匹配的分组',
     created: '创建时间',
     copyToClipboard: '复制到剪贴板',
     copied: '已复制！',

frontend/src/views/user/KeysView.vue

@@ -101,6 +101,7 @@
                 <span v-else class="text-sm text-gray-400 dark:text-dark-500">{{
                   t('keys.noGroup')
                 }}</span>
+                <span class="text-xs text-gray-500 dark:text-gray-400">{{ t('keys.selectGroup') }}</span>
                 <svg
                   class="h-3.5 w-3.5 text-gray-400 opacity-60 transition-opacity group-hover/dropdown:opacity-100"
                   fill="none"
@@ -385,6 +386,8 @@
             v-model="formData.group_id"
             :options="groupOptions"
             :placeholder="t('keys.selectGroup')"
+            :searchable="true"
+            :search-placeholder="t('keys.searchGroup')"
             data-tour="key-form-group"
           >
             <template #selected="{ option }">
@@ -955,17 +958,38 @@
       <div
         v-if="groupSelectorKeyId !== null && dropdownPosition"
         ref="dropdownRef"
-        class="animate-in fade-in slide-in-from-top-2 fixed z-[100000020] w-auto min-w-[280px] max-w-[480px] overflow-hidden rounded-xl bg-white shadow-lg ring-1 ring-black/5 duration-200 dark:bg-dark-800 dark:ring-white/10"
+        class="animate-in fade-in slide-in-from-top-2 fixed z-[100000020] w-max min-w-[380px] overflow-hidden rounded-xl bg-white shadow-lg ring-1 ring-black/5 duration-200 dark:bg-dark-800 dark:ring-white/10"
         style="pointer-events: auto !important;"
-        :style="{ top: dropdownPosition.top + 'px', left: dropdownPosition.left + 'px' }"
+        :style="{
+          top: dropdownPosition.top !== undefined ? dropdownPosition.top + 'px' : undefined,
+          bottom: dropdownPosition.bottom !== undefined ? dropdownPosition.bottom + 'px' : undefined,
+          left: dropdownPosition.left + 'px'
+        }"
       >
-        <div class="max-h-64 overflow-y-auto p-1.5">
+        <!-- Search box -->
+        <div class="border-b border-gray-100 p-2 dark:border-dark-700">
+          <div class="relative">
+            <svg class="absolute left-2.5 top-1/2 h-4 w-4 -translate-y-1/2 text-gray-400" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="2">
+              <path stroke-linecap="round" stroke-linejoin="round" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z" />
+            </svg>
+            <input
+              v-model="groupSearchQuery"
+              type="text"
+              class="w-full rounded-lg border border-gray-200 bg-gray-50 py-1.5 pl-8 pr-3 text-sm text-gray-900 placeholder-gray-400 outline-none focus:border-primary-300 focus:ring-1 focus:ring-primary-300 dark:border-dark-600 dark:bg-dark-700 dark:text-white dark:placeholder-gray-500 dark:focus:border-primary-600 dark:focus:ring-primary-600"
+              :placeholder="t('keys.searchGroup')"
+              @click.stop
+            />
+          </div>
+        </div>
+        <!-- Group list -->
+        <div class="max-h-80 overflow-y-auto p-1.5">
           <button
-            v-for="option in groupOptions"
+            v-for="option in filteredGroupOptions"
             :key="option.value ?? 'null'"
             @click="changeGroup(selectedKeyForGroup!, option.value)"
             :class="[
-              'flex w-full items-center justify-between rounded-lg px-3 py-2 text-sm transition-colors',
+              'flex w-full items-center justify-between rounded-lg px-3 py-2.5 text-sm transition-colors',
+              'border-b border-gray-100 last:border-0 dark:border-dark-700',
               selectedKeyForGroup?.group_id === option.value ||
               (!selectedKeyForGroup?.group_id && option.value === null)
                 ? 'bg-primary-50 dark:bg-primary-900/20'
@@ -986,6 +1010,10 @@
               "
             />
           </button>
+          <!-- Empty state when search has no results -->
+          <div v-if="filteredGroupOptions.length === 0" class="py-4 text-center text-sm text-gray-400 dark:text-gray-500">
+            {{ t('keys.noGroupFound') }}
+          </div>
         </div>
       </div>
     </Teleport>
@@ -1085,7 +1113,7 @@ const copiedKeyId = ref<number | null>(null)
 const groupSelectorKeyId = ref<number | null>(null)
 const publicSettings = ref<PublicSettings | null>(null)
 const dropdownRef = ref<HTMLElement | null>(null)
-const dropdownPosition = ref<{ top: number; left: number } | null>(null)
+const dropdownPosition = ref<{ top?: number; bottom?: number; left: number } | null>(null)
 const groupButtonRefs = ref<Map<number, HTMLElement>>(new Map())
 let abortController: AbortController | null = null
 
@@ -1189,6 +1217,17 @@ const groupOptions = computed(() =>
   }))
 )
 
+// Group dropdown search
+const groupSearchQuery = ref('')
+const filteredGroupOptions = computed(() => {
+  const query = groupSearchQuery.value.trim().toLowerCase()
+  if (!query) return groupOptions.value
+  return groupOptions.value.filter((opt) => {
+    return opt.label.toLowerCase().includes(query) ||
+      (opt.description && opt.description.toLowerCase().includes(query))
+  })
+})
+
 const maskKey = (key: string): string => {
   if (key.length <= 12) return key
   return `${key.slice(0, 8)}...${key.slice(-4)}`
@@ -1348,12 +1387,26 @@ const openGroupSelector = (key: ApiKey) => {
     const buttonEl = groupButtonRefs.value.get(key.id)
     if (buttonEl) {
       const rect = buttonEl.getBoundingClientRect()
-      dropdownPosition.value = {
-        top: rect.bottom + 4,
-        left: rect.left
+      const dropdownEstHeight = 400 // estimated max dropdown height
+      const spaceBelow = window.innerHeight - rect.bottom
+      const spaceAbove = rect.top
+
+      if (spaceBelow < dropdownEstHeight && spaceAbove > spaceBelow) {
+        // Not enough space below, pop upward
+        dropdownPosition.value = {
+          bottom: window.innerHeight - rect.top + 4,
+          left: rect.left
+        }
+      } else {
+        // Default: pop downward
+        dropdownPosition.value = {
+          top: rect.bottom + 4,
+          left: rect.left
+        }
       }
     }
     groupSelectorKeyId.value = key.id
+    groupSearchQuery.value = ''
   }
 }