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/styles.css

@@ -192,13 +192,16 @@ body,
 
 body {
   font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
-  background:
-    url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='0.15'/%3E%3C/svg%3E"),
-    linear-gradient(rgba(0, 0, 0, 0.95), rgba(0, 0, 0, 0.95)),
-    radial-gradient(ellipse 120% 60% at 50% -10%, rgba(212, 175, 55, 0.14), transparent 55%),
-    url('./assets/images/bg.png') no-repeat center center fixed;
-  background-size: 150px, cover, cover, cover;
+  /* 保留 bg 位图；用 scroll 替代 fixed，减轻移动端滚动重绘（后续可换 WebP/AVIF） */
   background-color: var(--tertiary);
+  background-image:
+    radial-gradient(ellipse 120% 60% at 50% -10%, rgba(212, 175, 55, 0.14), transparent 55%),
+    linear-gradient(rgba(0, 0, 0, 0.88), rgba(0, 0, 0, 0.88)),
+    url('./assets/images/bg.png');
+  background-repeat: no-repeat;
+  background-position: center center;
+  background-size: cover;
+  background-attachment: scroll;
   color: var(--text);
   overflow: hidden;
   -webkit-font-smoothing: antialiased;
@@ -294,8 +297,7 @@ input:-webkit-autofill:active {
   padding: 16px;
   margin-bottom: 12px;
   box-shadow: var(--shadow);
-  backdrop-filter: blur(10px);
-  -webkit-backdrop-filter: blur(10px);
+  background: rgba(26, 26, 26, 0.92);
 }
 
 .section-title {