feat(lottery): 扩展传统马来赔率、玩法结算与开注商短码支持

database/migrations/2026_07_10_120000_add_short_code_to_bet_providers.php

@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('bet_providers', function (Blueprint $table): void {
+            $table->string('short_code', 1)->nullable()->after('name');
+        });
+
+        DB::table('bet_providers')->orderBy('id')->get(['id', 'code'])->each(function (object $provider): void {
+            DB::table('bet_providers')
+                ->where('id', $provider->id)
+                ->update(['short_code' => strtoupper(substr((string) $provider->code, 0, 1))]);
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('bet_providers', function (Blueprint $table): void {
+            $table->dropColumn('short_code');
+        });
+    }
+};