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/maxmind/instance.go

@@ -6,7 +6,6 @@ import (
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	"github.com/yusing/godoxy/internal/notif"
-	gperr "github.com/yusing/goutils/errs"
 	"github.com/yusing/goutils/task"
 )
 
@@ -24,7 +23,7 @@ func warnNotConfigured() {
 	})
 }
 
-func SetInstance(parent task.Parent, cfg *Config) gperr.Error {
+func SetInstance(parent task.Parent, cfg *Config) error {
 	newInstance := &MaxMind{Config: cfg}
 	if err := newInstance.LoadMaxMindDB(parent); err != nil {
 		return err