feat(i18n): 管理端与玩家端三语支持（中/英/马来语）

- 管理后台 adminT 文案库、结算与代理端页面、表单校验
- 玩家端 vue-i18n 补全首页/公告/串关与 ms 文案
- Element Plus ms 语言包与共享 locale 工具

packages/shared/src/betting-rules.ts

@@ -0,0 +1,64 @@
+/** 第一版仅足球；字段预留其他 sportType */
+export const SPORT_TYPE_FOOTBALL = 'FOOTBALL';
+
+/** 常规赛事发布时生成的赛前盘口（手动维护，不含冠军盘） */
+export const STANDARD_PREMATCH_MARKET_TYPES = [
+  'FT_1X2',
+  'FT_HANDICAP',
+  'FT_OVER_UNDER',
+  'FT_ODD_EVEN',
+  'HT_1X2',
+  'HT_HANDICAP',
+  'HT_OVER_UNDER',
+  'FT_CORRECT_SCORE',
+  'HT_CORRECT_SCORE',
+  'SH_CORRECT_SCORE',
+] as const;
+
+export const HANDICAP_TOTAL_MARKET_TYPES = [
+  'FT_HANDICAP',
+  'HT_HANDICAP',
+  'FT_OVER_UNDER',
+  'HT_OVER_UNDER',
+] as const;
+
+export type ParlayRejectReason = 'OUTRIGHT' | 'NOT_ALLOWED' | 'QUARTER_LINE';
+
+export function isQuarterLine(line: number | null | undefined): boolean {
+  if (line == null || Number.isNaN(line)) return false;
+  const frac = Math.abs(line % 1);
+  return Math.abs(frac - 0.25) < 0.001 || Math.abs(frac - 0.75) < 0.001;
+}
+
+export function isQuarterHandicapOrTotal(line: number | null | undefined): boolean {
+  return isQuarterLine(line);
+}
+
+export function canSelectForParlay(params: {
+  marketType: string;
+  lineValue?: number | null;
+  allowParlay?: boolean;
+  isOutright?: boolean;
+}): { ok: true } | { ok: false; reason: ParlayRejectReason } {
+  if (params.marketType === 'OUTRIGHT_WINNER' || params.isOutright) {
+    return { ok: false, reason: 'OUTRIGHT' };
+  }
+  if (params.allowParlay === false) {
+    return { ok: false, reason: 'NOT_ALLOWED' };
+  }
+  if (
+    (HANDICAP_TOTAL_MARKET_TYPES as readonly string[]).includes(params.marketType) &&
+    isQuarterHandicapOrTotal(params.lineValue ?? null)
+  ) {
+    return { ok: false, reason: 'QUARTER_LINE' };
+  }
+  return { ok: true };
+}
+
+export function isPreMatchKickoff(startTime: Date | string): boolean {
+  return new Date() < new Date(startTime);
+}
+
+export function isSupportedSport(sportType: string | null | undefined): boolean {
+  return (sportType ?? SPORT_TYPE_FOOTBALL) === SPORT_TYPE_FOOTBALL;
+}

packages/shared/src/index.ts

@@ -102,7 +102,7 @@ export enum WalletStatus {
 // Locale
 export const SUPPORTED_LOCALES = ['zh-CN', 'ms-MY', 'en-US'] as const;
 export type Locale = (typeof SUPPORTED_LOCALES)[number];
-export const DEFAULT_LOCALE: Locale = 'en-US';
+export const DEFAULT_LOCALE: Locale = 'zh-CN';
 
 // Admin roles
 export enum AdminRole {
@@ -115,6 +115,9 @@ export enum AdminRole {
 export const PARLAY_MIN_LEGS = 2;
 export const PARLAY_MAX_LEGS = 5;
 
+export * from './betting-rules';
+export * from './locale';
+
 export interface ApiResponse<T = unknown> {
   success: boolean;
   data?: T;

packages/shared/src/locale.ts

@@ -0,0 +1,28 @@
+/** 内容翻译 fallback：当前语言 → 英文 → 中文 */
+export function resolveTranslationFallback(
+  map: Record<string, string | undefined | null>,
+  locale: string,
+): string {
+  const chain = [locale, 'en-US', 'zh-CN'];
+  const seen = new Set<string>();
+  for (const loc of chain) {
+    if (seen.has(loc)) continue;
+    seen.add(loc);
+    const v = map[loc];
+    if (v != null && String(v).trim() !== '') return String(v).trim();
+  }
+  for (const v of Object.values(map)) {
+    if (v != null && String(v).trim() !== '') return String(v).trim();
+  }
+  return '';
+}
+
+/** 前台语言显示名（PRD 3.1） */
+export const LOCALE_UI_LABELS: Record<string, string> = {
+  'zh-CN': '中文',
+  'ms-MY': 'Bahasa Melayu',
+  'en-US': 'English',
+};
+
+/** vue-i18n 缺 key 时：en-US → zh-CN */
+export const VUE_I18N_FALLBACK_LOCALES = ['en-US', 'zh-CN'] as const;