chore(logging): 默认使用 console 普通日志输出

- 将配置默认 log.format 从 json 调整为 console\n- 将 logger 初始化兜底默认格式调整为 console\n- 同步更新 deploy 配置示例

backend/internal/config/config.go

@@ -866,7 +866,7 @@ func setDefaults() {
 
 	// Log
 	viper.SetDefault("log.level", "info")
-	viper.SetDefault("log.format", "json")
+	viper.SetDefault("log.format", "console")
 	viper.SetDefault("log.service_name", "sub2api")
 	viper.SetDefault("log.env", "production")
 	viper.SetDefault("log.caller", true)

backend/internal/pkg/logger/options.go

@@ -53,7 +53,7 @@ func (o InitOptions) normalized() InitOptions {
 	}
 	out.Format = strings.ToLower(strings.TrimSpace(out.Format))
 	if out.Format == "" {
-		out.Format = "json"
+		out.Format = "console"
 	}
 	out.ServiceName = strings.TrimSpace(out.ServiceName)
 	if out.ServiceName == "" {