feat(admin,api,player): 赛事分组管理、盘口独立页与多语言展示优化

- 管理端按联赛展示单场，新增赛事/单场流程与列表展开状态保持

- 盘口赔率迁至独立页面，保存按钮仅在有修改时高亮

- API 新增联赛列表与子场查询，按 locale 返回队名并修复编译

- 波胆其它选项与促销标签等 i18n 补齐，文案更易懂

apps/admin/src/components/outright/CountryFlagSelect.vue

@@ -1,8 +1,9 @@
 <script setup lang="ts">
 import { computed, ref } from 'vue';
 import {
-  BUILTIN_COUNTRIES,
   countryFlagUrl,
+  countryDisplayName,
+  countryOptionLabel,
   getBuiltinCountry,
   searchBuiltinCountries,
   type BuiltinCountry,
@@ -13,6 +14,7 @@ const props = defineProps<{
   modelValue: string;
   size?: 'small' | 'default' | 'large';
   disabled?: boolean;
+  hidePreview?: boolean;
 }>();
 
 const emit = defineEmits<{
@@ -23,14 +25,12 @@ const emit = defineEmits<{
 const { t, locale } = useAdminLocale();
 
 const filterKeyword = ref('');
-const options = computed(() => searchBuiltinCountries(filterKeyword.value));
+const options = computed(() => searchBuiltinCountries(filterKeyword.value, locale.value));
 
 const selected = computed(() => getBuiltinCountry(props.modelValue));
 
 function optionLabel(c: BuiltinCountry) {
-  return locale.value === 'en-US'
-    ? `${c.nameEn} (${c.code})`
-    : `${c.nameZh} (${c.code})`;
+  return countryOptionLabel(c, locale.value);
 }
 
 function onFilter(q: string) {
@@ -67,13 +67,13 @@ function onChange(code: string | undefined) {
       >
         <div class="country-option">
           <img :src="countryFlagUrl(c)" alt="" class="country-option-flag" loading="lazy" />
-          <span class="country-option-name">{{ c.nameZh }} · {{ c.nameEn }}</span>
+          <span class="country-option-name">{{ countryDisplayName(c, locale) }}</span>
           <span class="country-option-code">{{ c.code }}</span>
         </div>
       </el-option>
     </el-select>
     <img
-      v-if="selected"
+      v-if="selected && !hidePreview"
       :src="countryFlagUrl(selected)"
       alt=""
       class="country-preview"