后端与全仓代码质量清理（golangci 扩展集 · 测试质量 · 并发安全 · 文档同步）

代码质量全量清理，零行为变化：golangci 扩展集 13 类 linter（gosec/modernize/perfsprint/canonicalheader/usestdlibvars/wastedassign/intrange/errorlint/forcetypeassert/recvcheck/exhaustive/unparam）全量修复，测试代码质量（testifylint/thelper/usetesting）25→0，frpc 进程生命周期真 bug（进程组击杀）、全仓 go test -race 6 类数据竞争（含 1 个生产竞争）、SPDX license 头补齐 131 文件、前端测试套件 next-intl 迁移后 44 失败→全绿、过期 swagger 文档重新生成、pnpm-workspace 构建审批。

Experiments: #2-#17, #18, #20, #21, #23
Metric: total_issues 108 → 8 (-92.6%)

internal/apps/admin/logs/utils.go

@@ -35,8 +35,8 @@ func getUpgrader() *websocket.Upgrader {
 			ctx := r.Context()
 			if sc, err := repository.GetSystemConfigByKey(ctx, model.ConfigKeyServerAddress); err == nil && sc.Value != "" {
 				originToCheck := strings.TrimRight(strings.TrimSpace(origin), "/")
-				allowedOrigins := strings.Split(sc.Value, ",")
-				for _, allowed := range allowedOrigins {
+				allowedOrigins := strings.SplitSeq(sc.Value, ",")
+				for allowed := range allowedOrigins {
 					allowed = strings.TrimRight(strings.TrimSpace(allowed), "/")
 					if allowed != "" && strings.EqualFold(allowed, originToCheck) {
 						return true
@@ -49,15 +49,15 @@ func getUpgrader() *websocket.Upgrader {
 }
 
 // parsePositiveInt 解析非负整数字符串
-func parsePositiveInt(s string, result *int) (bool, error) {
+func parsePositiveInt(s string, result *int) error {
 	if s == "" {
 		*result = 0
-		return true, nil
+		return nil
 	}
 	n, err := strconv.Atoi(s)
 	if err != nil || n < 0 {
-		return false, err
+		return err
 	}
 	*result = n
-	return true, nil
+	return nil
 }