fix(frontend): stack quota badges vertically in capacity column

QuotaBadge components (daily/weekly/total) were wrapped in a
horizontal flex container, making them visually inconsistent with
other capacity badges (concurrency, window cost, sessions, RPM)
which stack vertically. Remove the wrapper so all badges align
consistently.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

frontend/src/components/account/AccountCapacityCell.vue

@@ -73,11 +73,9 @@
     </div>
 
     <!-- API Key 账号配额限制 -->
-    <div v-if="showDailyQuota || showWeeklyQuota || showTotalQuota" class="flex items-center gap-1">
-      <QuotaBadge v-if="showDailyQuota" :used="account.quota_daily_used ?? 0" :limit="account.quota_daily_limit!" label="D" />
-      <QuotaBadge v-if="showWeeklyQuota" :used="account.quota_weekly_used ?? 0" :limit="account.quota_weekly_limit!" label="W" />
-      <QuotaBadge v-if="showTotalQuota" :used="account.quota_used ?? 0" :limit="account.quota_limit!" />
-    </div>
+    <QuotaBadge v-if="showDailyQuota" :used="account.quota_daily_used ?? 0" :limit="account.quota_daily_limit!" label="D" />
+    <QuotaBadge v-if="showWeeklyQuota" :used="account.quota_weekly_used ?? 0" :limit="account.quota_weekly_limit!" label="W" />
+    <QuotaBadge v-if="showTotalQuota" :used="account.quota_used ?? 0" :limit="account.quota_limit!" />
   </div>
 </template>