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/acl/matcher.go

@@ -2,6 +2,7 @@ package acl
 
 import (
 	"bytes"
+	"errors"
 	"net"
 	"strings"
 
@@ -38,9 +39,9 @@ var errMatcherFormat = gperr.Multiline().AddLines(
 )
 
 var (
-	errSyntax      = gperr.New("syntax error")
-	errInvalidIP   = gperr.New("invalid IP")
-	errInvalidCIDR = gperr.New("invalid CIDR")
+	errSyntax      = errors.New("syntax error")
+	errInvalidIP   = errors.New("invalid IP")
+	errInvalidCIDR = errors.New("invalid CIDR")
 )
 
 func (matcher *Matcher) Parse(s string) error {