modernize 37→5（-32）：interface{}→any、内置 max/min、slices/maps 辅助、strings.Cut/SplitSeq、strings.Builder（修复 mail.go O(n²) 拼接）。逐 hunk 核对语义等价；omitzero 冲突修复被自动跳过（wire 格式不变）；手动清 4 处遗留 sort import + 2 处 QF1012。

Result: {"status":"keep","total_issues":74,"golint_canonicalheader":8,"golint_errname":1,"golint_errorlint":12,"golint_forcetypeassert":3,"golint_gosec":0,"golint_intrange":3,"golint_modernize":5,"golint_nilnil":3,"golint_perfsprint":18,"golint_prealloc":3,"golint_recvcheck":7,"golint_usestdlibvars":3,"golint_wastedassign":7,"golint_total":73,"eslint_problems":1,"eslint_errors":0,"eslint_warnings":1,"tsc_errors":0,"measure_s":38}

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.