feat(bet-provider): 添加开注商管理功能，包括增删改查接口及相关模型和迁移文件

database/migrations/2026_07_08_150000_create_bet_providers_table.php

@@ -0,0 +1,37 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('bet_providers', function (Blueprint $table): void {
+            $table->id();
+            $table->string('code', 32)->unique();
+            $table->string('name', 64);
+            $table->boolean('is_enabled')->default(true);
+            $table->unsignedInteger('sort_order')->default(0);
+            $table->timestamps();
+        });
+
+        Schema::table('ticket_items', function (Blueprint $table): void {
+            $table->string('provider_code', 32)->default('SG')->after('draw_id');
+            $table->string('provider_name', 64)->default('Singapore')->after('provider_code');
+            $table->index('provider_code', 'idx_ticket_items_provider_code');
+        });
+
+    }
+
+    public function down(): void
+    {
+        Schema::table('ticket_items', function (Blueprint $table): void {
+            $table->dropIndex('idx_ticket_items_provider_code');
+            $table->dropColumn(['provider_code', 'provider_name']);
+        });
+
+        Schema::dropIfExists('bet_providers');
+    }
+};