feat: internationalize API error responses by locale

Add shared error codes with zh/en/ms messages, coded app exceptions,
and locale-aware global filter. Frontends send X-Locale so error text
matches the active UI language.

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

apps/api/src/domains/odds/markets.service.ts

@@ -1,10 +1,11 @@
-import { Injectable, BadRequestException, NotFoundException } from '@nestjs/common';
+import { Injectable } from '@nestjs/common';
 import { PrismaService } from '../../shared/prisma/prisma.service';
 import { Decimal } from '@prisma/client/runtime/library';
 import {
   FT_CORRECT_SCORE_TEMPLATE,
   HT_CORRECT_SCORE_TEMPLATE,
 } from '../settlement/domain/settlement-calculator';
+import { appBadRequest, appNotFound } from '../../shared/common/app-error';
 
 @Injectable()
 export class MarketsService {
@@ -12,7 +13,7 @@ export class MarketsService {
 
   async generateTemplates(matchId: bigint, marketTypes: string[]) {
     const match = await this.prisma.match.findUnique({ where: { id: matchId } });
-    if (!match) throw new NotFoundException('Match not found');
+    if (!match) throw appNotFound('MATCH_NOT_FOUND');
 
     const created = [];
 
@@ -181,7 +182,7 @@ export class MarketsService {
     };
 
     const config = configs[marketType];
-    if (!config) throw new BadRequestException(`Unknown market type: ${marketType}`);
+    if (!config) throw appBadRequest('UNKNOWN_MARKET_TYPE', { marketType });
     return config;
   }
 
@@ -189,8 +190,8 @@ export class MarketsService {
     const selection = await this.prisma.marketSelection.findUnique({
       where: { id: selectionId },
     });
-    if (!selection) throw new NotFoundException('Selection not found');
-    if (newOdds <= 1) throw new BadRequestException('Odds must be > 1.00');
+    if (!selection) throw appNotFound('SELECTION_NOT_FOUND');
+    if (newOdds <= 1) throw appBadRequest('ODDS_MIN');
 
     const newVersion = selection.oddsVersion + BigInt(1);
 
@@ -228,7 +229,7 @@ export class MarketsService {
     data: { promoLabel?: string | null; status?: string; lineValue?: number | null },
   ) {
     const market = await this.prisma.market.findUnique({ where: { id: marketId } });
-    if (!market) throw new NotFoundException('Market not found');
+    if (!market) throw appNotFound('MARKET_NOT_FOUND');
 
     return this.prisma.market.update({
       where: { id: marketId },
@@ -248,10 +249,10 @@ export class MarketsService {
     const selection = await this.prisma.marketSelection.findUnique({
       where: { id: selectionId },
     });
-    if (!selection) throw new NotFoundException('Selection not found');
+    if (!selection) throw appNotFound('SELECTION_NOT_FOUND');
 
     if (data.odds != null) {
-      if (!operatorId) throw new BadRequestException('Operator required for odds update');
+      if (!operatorId) throw appBadRequest('OPERATOR_REQUIRED');
       return this.updateOdds(selectionId, data.odds, operatorId);
     }