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/api/prisma/migrations/20260612120000_user_preference_phone_split/migration.sql

@@ -0,0 +1,26 @@
+ALTER TABLE "user_preferences"
+  ADD COLUMN IF NOT EXISTS "phone_country_dial" VARCHAR(8),
+  ADD COLUMN IF NOT EXISTS "phone_local" VARCHAR(24);
+
+CREATE INDEX IF NOT EXISTS "user_preferences_phone_country_dial_phone_local_idx"
+  ON "user_preferences" ("phone_country_dial", "phone_local");
+
+-- 回填已有手机号的区号/本地号（username 为纯数字国际号码时）
+UPDATE "user_preferences" up
+SET
+  "phone_country_dial" = matched.dial,
+  "phone_local" = SUBSTRING(u.username FROM (LENGTH(matched.dial) + 1))
+FROM "users" u
+JOIN LATERAL (
+  SELECT dial FROM (
+    VALUES ('880'), ('886'), ('60'), ('65'), ('66'), ('84'), ('91'), ('61')
+  ) AS d(dial)
+  WHERE u.username LIKE d.dial || '%'
+  ORDER BY LENGTH(d.dial) DESC
+  LIMIT 1
+) matched ON TRUE
+WHERE up.user_id = u.id
+  AND up.phone IS NOT NULL
+  AND up.phone_country_dial IS NULL
+  AND u.username ~ '^[0-9]+$'
+  AND LENGTH(u.username) >= 10;