fix: JWT密钥YAML格式和401错误处理

- 修复JWT密钥在YAML配置文件中未加引号导致解析错误的问题
- 添加dashboard页面401错误处理，自动清除token并跳转登录页

backend/internal/router/install/install.go

@@ -299,7 +299,7 @@ func generateConfigFile(dbType string, req SetupRequest, jwtSecret string) strin
 	content.WriteString("  name: verification-platform\n")
 	content.WriteString("  env: production\n")
 	content.WriteString("  port: \"8080\"\n")
-	content.WriteString(fmt.Sprintf("  jwt_secret: %s\n", jwtSecret))
+	content.WriteString(fmt.Sprintf("  jwt_secret: \"%s\"\n", jwtSecret))
 	content.WriteString("  jwt_expire: 24h\n\n")
 
 	content.WriteString("# 数据库配置\n")