feat(admin): 将新增赛事按钮移至联赛操作栏，并移除列表下方的旧按钮

apps/admin/src/views/matches/LeagueMatchesPanel.vue

@@ -328,11 +328,7 @@ defineExpose({ reload: load });
 
 <template>
   <div class="league-matches-panel">
-    <div class="nested-panel-toolbar">
-      <el-button type="primary" size="small" @click.stop="emit('add-match')">
-        {{ t('match.create_fixture_btn') }}
-      </el-button>
-    </div>
+
     <el-table v-loading="loading" :data="matches" stripe row-key="id" class="nested-match-table">
       <el-table-column type="index" :index="(i: number) => (matchPage - 1) * matchPageSize + i + 1" :label="t('common.seq')" width="70" align="center" />
       <el-table-column :label="t('match.col.matchup')" min-width="180">