feat: 增强玩家 API，新增 locale 和时间字段，更新钱包 API 以支持可用余额计算，添加错误码与多语言支持

app/Http/Controllers/Api/V1/Admin/Player/PlayerWalletShowController.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Http\Controllers\Api\V1\Admin\Player;
+
+use App\Http\Controllers\Controller;
+use App\Models\Player;
+use App\Models\PlayerWallet;
+use App\Support\ApiResponse;
+use Illuminate\Http\JsonResponse;
+
+/**
+ * 后台：按玩家查询钱包余额（`player_wallets` 全币种）。
+ *
+ * 路由：`GET /api/v1/admin/players/{player}/wallets`
+ */
+final class PlayerWalletShowController extends Controller
+{
+    public function __invoke(Player $player): JsonResponse
+    {
+        $wallets = PlayerWallet::query()
+            ->where('player_id', $player->id)
+            ->orderBy('wallet_type')
+            ->orderBy('currency_code')
+            ->get();
+
+        $rows = $wallets->map(static function (PlayerWallet $w): array {
+            $bal = (int) $w->balance;
+            $frozen = (int) $w->frozen_balance;
+
+            return [
+                'id' => $w->id,
+                'wallet_type' => $w->wallet_type,
+                'currency_code' => $w->currency_code,
+                'balance' => $bal,
+                'frozen_balance' => $frozen,
+                'available_balance' => max(0, $bal - $frozen),
+                'status' => (int) $w->status,
+                'version' => (int) $w->version,
+            ];
+        })->values()->all();
+
+        return ApiResponse::success([
+            'player' => [
+                'id' => $player->id,
+                'site_code' => $player->site_code,
+                'site_player_id' => $player->site_player_id,
+                'username' => $player->username,
+                'nickname' => $player->nickname,
+                'default_currency' => $player->default_currency,
+                'status' => (int) $player->status,
+            ],
+            'wallets' => $rows,
+        ]);
+    }
+}