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/infra/task/utils.go

@@ -15,7 +15,7 @@ type redisClientConnOpt struct {
 	options redis.Options
 }
 
-func (opt redisClientConnOpt) MakeRedisClient() interface{} {
+func (opt redisClientConnOpt) MakeRedisClient() any {
 	return redis.NewClient(&opt.options)
 }
 
@@ -23,7 +23,7 @@ type redisClusterConnOpt struct {
 	options redis.ClusterOptions
 }
 
-func (opt redisClusterConnOpt) MakeRedisClient() interface{} {
+func (opt redisClusterConnOpt) MakeRedisClient() any {
 	return redis.NewClusterClient(&opt.options)
 }
 
@@ -32,7 +32,7 @@ type redisFailoverConnOpt struct {
 	maintNotificationsEnabled bool
 }
 
-func (opt redisFailoverConnOpt) MakeRedisClient() interface{} {
+func (opt redisFailoverConnOpt) MakeRedisClient() any {
 	client := redis.NewFailoverClient(&opt.options)
 	// go-redis v9.16 does not expose maintenance notification settings on
 	// FailoverOptions, so apply the configured mode before the client is used.