refactor(errs): migrate from gperr.Error to standard Go error interface

This is a large-scale refactoring across the codebase that replaces the custom
`gperr.Error` type with Go's standard `error` interface. The changes include:

- Replacing `gperr.Error` return types with `error` in function signatures
- Using `errors.New()` and `fmt.Errorf()` instead of `gperr.New()` and `gperr.Errorf()`
- Using `%w` format verb for error wrapping instead of `.With()` method
- Replacing `gperr.Subject()` calls with `gperr.PrependSubject()`
- Converting error logging from `gperr.Log*()` functions to zerolog's `.Err().Msg()` pattern
- Update NewLogger to handle multiline error message
- Updating `goutils` submodule to latest commit

This refactoring aligns with Go idioms and removes the dependency on
custom error handling abstractions in favor of standard library patterns.

internal/api/v1/docker/info.go

@@ -59,7 +59,7 @@ func Info(c *gin.Context) {
 	serveHTTP[dockerInfo](c, GetDockerInfo)
 }
 
-func GetDockerInfo(ctx context.Context, dockerClients DockerClients) ([]dockerInfo, gperr.Error) {
+func GetDockerInfo(ctx context.Context, dockerClients DockerClients) ([]dockerInfo, error) {
 	errs := gperr.NewBuilder("failed to get docker info")
 	dockerInfos := make([]dockerInfo, len(dockerClients))
 
@@ -67,7 +67,7 @@ func GetDockerInfo(ctx context.Context, dockerClients DockerClients) ([]dockerIn
 	for name, dockerClient := range dockerClients {
 		info, err := dockerClient.Info(ctx, client.InfoOptions{})
 		if err != nil {
-			errs.Add(err)
+			errs.AddSubject(err, name)
 			continue
 		}
 		info.Info.Name = name