Fix Prettier formatting issues

- Remove trailing whitespace and fix indentation in src/app.js
- Format whitespace in src/middleware/auth.js
- Fix formatting and add missing newline in src/middleware/browserFallback.js

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/app.js

@@ -109,7 +109,7 @@ class Application {
       } else {
         this.app.use(corsMiddleware)
       }
-      
+
       // 🆕 兜底中间件：处理Chrome插件兼容性（必须在认证之前）
       this.app.use(browserFallbackMiddleware)
 
@@ -541,7 +541,7 @@ class Application {
     logger.info(
       `🔄 Cleanup tasks scheduled every ${config.system.cleanupInterval / 1000 / 60} minutes`
     )
-    
+
     // 🚨 启动限流状态自动清理服务
     // 每5分钟检查一次过期的限流状态，确保账号能及时恢复调度
     const rateLimitCleanupService = require('./services/rateLimitCleanupService')
@@ -567,7 +567,7 @@ class Application {
           } catch (error) {
             logger.error('❌ Error cleaning up pricing service:', error)
           }
-          
+
           // 停止限流清理服务
           try {
             const rateLimitCleanupService = require('./services/rateLimitCleanupService')