feat: 更新数据库填充器以支持开发环境的管理员和玩家数据填充，新增示例钱包余额配置

database/seeders/CurrencySeeder.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace Database\Seeders;
+
+use Illuminate\Database\Seeder;
+use Illuminate\Support\Facades\DB;
+
+/**
+ * 写入 `currencies`，与 `docs/04`、`LOTTERY_DEFAULT_CURRENCY` 对齐。
+ */
+class CurrencySeeder extends Seeder
+{
+    public function run(): void
+    {
+        $rows = [
+            [
+                'code' => 'NPR',
+                'name' => 'Nepalese Rupee',
+                'decimal_places' => 2,
+                'is_enabled' => true,
+                'is_bettable' => true,
+            ],
+            [
+                'code' => 'USD',
+                'name' => 'US Dollar',
+                'decimal_places' => 2,
+                'is_enabled' => true,
+                'is_bettable' => false,
+            ],
+        ];
+
+        foreach ($rows as $row) {
+            DB::table('currencies')->updateOrInsert(
+                ['code' => $row['code']],
+                [
+                    'name' => $row['name'],
+                    'decimal_places' => $row['decimal_places'],
+                    'is_enabled' => $row['is_enabled'],
+                    'is_bettable' => $row['is_bettable'],
+                    'created_at' => now(),
+                    'updated_at' => now(),
+                ],
+            );
+        }
+    }
+}