feat: 添加日语支持并优化国际化功能

refactor: 重构中间件和路由处理逻辑
fix: 修复音频示例API的错误处理
docs: 更新README和DOCKER_USAGE文档
style: 优化语言切换器样式
chore: 更新.gitignore添加生产环境配置文件

web/src/app/api/audio-example/route.ts

@@ -0,0 +1,86 @@
+import { NextRequest, NextResponse } from 'next/server';
+import { getLanguageFromRequest } from '@/lib/utils';
+import { useTranslation } from '@/i18n';
+import { fetchAndCacheProvidersLocal } from '@/lib/config-local';
+
+export async function GET(request: NextRequest) {
+  const lang = getLanguageFromRequest(request);
+  const { t } = await useTranslation(lang, 'errors');
+  
+  // 获取查询参数
+  const searchParams = request.nextUrl.searchParams;
+  const text = searchParams.get('t');
+  const voiceCode = searchParams.get('v');
+  const providerKey = searchParams.get('p'); // 从URL参数p获取providerKey
+  
+  // 验证必需参数
+  if (!text || !voiceCode || !providerKey) {
+    return NextResponse.json(
+      { error: t('invalid_request_parameters')},
+      { status: 400 }
+    );
+  }
+  
+  try {
+    // 获取TTS提供商配置
+    const config = await fetchAndCacheProvidersLocal(lang);
+    if (!config) {
+      return NextResponse.json(
+        { error: t('cannot_read_tts_provider_config') },
+        { status: 500 }
+      );
+    }
+    
+    // 检查配置中是否存在对应的提供商
+    if (!config[providerKey] || !config[providerKey].api_url) {
+      return NextResponse.json(
+        { error: t('invalid_provider')},
+        { status: 400 }
+      );
+    }
+    
+    // 构建目标URL
+    const templateUrl = config[providerKey].api_url;
+    const targetUrl = templateUrl
+      .replace('{{text}}', encodeURIComponent(text))
+      .replace('{{voiceCode}}', encodeURIComponent(voiceCode));
+    
+    // 发起请求到目标服务器
+    const response = await fetch(targetUrl, {
+      method: 'GET',
+      headers: {
+        'User-Agent': 'PodcastHub/1.0'
+      }
+    });
+    
+    // 检查响应状态
+    if (!response.ok) {
+      console.error(`TTS API error: ${response.status} ${response.statusText}`);
+      return NextResponse.json(
+        { error: t('internal_server_error') },
+        { status: response.status }
+      );
+    }
+    
+    // 获取响应内容类型
+    const contentType = response.headers.get('content-type') || 'audio/mpeg';
+    
+    // 将响应转换为流并返回
+    const arrayBuffer = await response.arrayBuffer();
+    const buffer = Buffer.from(arrayBuffer);
+    
+    return new NextResponse(buffer, {
+      headers: {
+        'Content-Type': contentType,
+        'Cache-Control': 'public, max-age=31536000',
+        'Content-Disposition': 'inline',
+      },
+    });
+  } catch (error: any) {
+    console.error('Error in audio-example API:', error);
+    return NextResponse.json(
+      { error: t('internal_server_error') },
+      { status: 500 }
+    );
+  }
+}