refactor: 重构语言协商中间件，简化语言解析逻辑并增强异常处理，更新相关配置以支持多环境开发

app/Support/LotteryLocale.php

@@ -0,0 +1,52 @@
+<?php
+
+namespace App\Support;
+
+use Illuminate\Http\Request;
+
+/**
+ * 与 NegotiateLotteryLocale 相同的协商规则；供异常 render 等非中间件链路使用。
+ */
+final class LotteryLocale
+{
+    public static function resolve(Request $request): string
+    {
+        /** @var list<string> $supported */
+        $supported = array_values(array_unique(config('lottery.locales.supported', ['en', 'zh', 'ne'])));
+        $fallback = (string) config('lottery.locales.fallback', 'en');
+
+        $header = strtolower(trim((string) $request->header('X-Locale', '')));
+        if ($header !== '' && in_array($header, $supported, true)) {
+            return $header;
+        }
+
+        return self::fromAcceptLanguage((string) $request->header('Accept-Language', ''), $supported, $fallback);
+    }
+
+    /** @param  list<string>  $supported */
+    private static function fromAcceptLanguage(string $header, array $supported, string $fallback): string
+    {
+        if ($header === '') {
+            return $fallback;
+        }
+
+        foreach (explode(',', $header) as $part) {
+            $code = strtolower(trim(explode(';', trim($part), 2)[0] ?? ''));
+            if ($code === '') {
+                continue;
+            }
+            $primary = explode('-', $code, 2)[0] ?? $code;
+            if ($primary === 'zh' && in_array('zh', $supported, true)) {
+                return 'zh';
+            }
+            if ($primary === 'ne' && in_array('ne', $supported, true)) {
+                return 'ne';
+            }
+            if ($primary === 'en' && in_array('en', $supported, true)) {
+                return 'en';
+            }
+        }
+
+        return $fallback;
+    }
+}

app/Support/LotteryMessage.php

@@ -22,7 +22,7 @@ final class LotteryMessage
     public static function sso(Request $request, int $code): string
     {
         $fallback = (string) config('lottery.locales.fallback', 'en');
-        $locale = (string) ($request->attributes->get('lottery_locale') ?? $fallback);
+        $locale = (string) ($request->attributes->get('lottery_locale') ?? LotteryLocale::resolve($request));
         $key = 'sso.'.$code; // 对应 lang/{locale}/sso.php 内键名，如 '8001'
 
         $msg = trans($key, [], $locale);