feat: 更新 .env.example 文件，新增彩票业务配置与 Redis、邮件、队列等环境变量，优化开发环境设置

tests/Feature/LotterySettingsTest.php

@@ -0,0 +1,30 @@
+<?php
+
+use App\Models\LotterySetting;
+use App\Services\LotterySettings;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Cache;
+
+uses(RefreshDatabase::class);
+
+test('lottery settings get returns seeded value', function (): void {
+    LotterySettings::put('fixture.flag', true, 'test', null);
+
+    expect(LotterySettings::get('fixture.flag'))->toBeTrue();
+});
+
+test('lottery settings misses are not cached', function (): void {
+    Cache::flush();
+
+    expect(LotterySettings::get('not.exists', 'fallback'))->toBe('fallback');
+
+    LotterySetting::query()->create([
+        'setting_key' => 'not.exists',
+        'value_json' => 'hello',
+        'group_name' => 'test',
+    ]);
+
+    LotterySettings::forgetKey('not.exists');
+
+    expect(LotterySettings::get('not.exists'))->toBe('hello');
+});