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/route/rules/error_format_test.go

@@ -3,7 +3,7 @@ package rules
 import (
 	"testing"
 
-	gperr "github.com/yusing/goutils/errs"
+	"github.com/rs/zerolog/log"
 )
 
 func TestErrorFormat(t *testing.T) {
@@ -19,5 +19,5 @@ func TestErrorFormat(t *testing.T) {
   do: set invalid_command
 - do: set resp_body "{{ .Request.Method {{ .Request.URL.Path }}"
 `, &rules)
-	gperr.LogError("error", err)
+	log.Err(err).Msg("error")
 }