feat(player): 注册账号、登录双模式与移动端性能优化

注册必填 7-32 位账号，手机号区号/本地号分存；登录默认账号模式并支持切换手机号登录；Player i18n 拆包与赛事接口优化。

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/player/src/components/LeagueAccordionItem.vue

@@ -102,7 +102,7 @@ const openCount = computed(() => props.matches.filter(m => m.matchPhase === 'ope
   content: '';
   position: absolute;
   inset: 0;
-  background: v-bind(matchCardBg) center top / 100% auto no-repeat;
+  background: v-bind(matchCardBg) center / 100% 100% no-repeat;
   opacity: 0.25;
   z-index: -1;
   pointer-events: none;