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

app/Http/Controllers/Api/V1/BetProvider/BetProviderIndexController.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\BetProvider;
+
+use App\Models\BetProvider;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+use App\Http\Controllers\Controller;
+
+/** GET /api/v1/bet-providers — 玩家端可选开注商。 */
+final class BetProviderIndexController extends Controller
+{
+    public function __invoke(): JsonResponse
+    {
+        $items = BetProvider::query()
+            ->where('is_enabled', true)
+            ->orderBy('sort_order')
+            ->orderBy('id')
+            ->get(['code', 'name', 'sort_order'])
+            ->map(fn (BetProvider $provider): array => [
+                'code' => $provider->code,
+                'name' => $provider->name,
+                'sort_order' => (int) $provider->sort_order,
+                'is_default' => $provider->code === BetProvider::DEFAULT_CODE,
+            ])
+            ->values()
+            ->all();
+
+        return ApiResponse::success(['items' => $items]);
+    }
+}