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/README.md

@@ -99,7 +99,7 @@ type Location struct {
 
 ```go
 // LoadMaxMindDB loads or downloads the MaxMind database.
-func (cfg *MaxMind) LoadMaxMindDB(parent task.Parent) gperr.Error
+func (cfg *MaxMind) LoadMaxMindDB(parent task.Parent) error
 ```
 
 ### Lookup
@@ -324,8 +324,8 @@ The maxmind package integrates with:
 
 ```go
 var (
-    ErrResponseNotOK   = gperr.New("response not OK")
-    ErrDownloadFailure = gperr.New("download failure")
+    ErrResponseNotOK   = errors.New("response not OK")
+    ErrDownloadFailure = errors.New("download failure")
 )
 ```
 

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

internal/maxmind/maxmind.go

@@ -16,7 +16,6 @@ import (
 	"github.com/oschwald/maxminddb-golang"
 	"github.com/yusing/godoxy/internal/common"
 	maxmind "github.com/yusing/godoxy/internal/maxmind/types"
-	gperr "github.com/yusing/goutils/errs"
 	"github.com/yusing/goutils/task"
 )
 
@@ -52,8 +51,8 @@ var httpClient = &http.Client{
 }
 
 var (
-	ErrResponseNotOK   = gperr.New("response not OK")
-	ErrDownloadFailure = gperr.New("download failure")
+	ErrResponseNotOK   = errors.New("response not OK")
+	ErrDownloadFailure = errors.New("download failure")
 )
 
 func (cfg *MaxMind) dbPath() string {
@@ -74,7 +73,7 @@ func (cfg *MaxMind) dbFilename() string {
 	return "GeoIP2-Country.mmdb"
 }
 
-func (cfg *MaxMind) LoadMaxMindDB(parent task.Parent) gperr.Error {
+func (cfg *MaxMind) LoadMaxMindDB(parent task.Parent) error {
 	if cfg.Database == "" {
 		return nil
 	}
@@ -92,7 +91,7 @@ func (cfg *MaxMind) LoadMaxMindDB(parent task.Parent) gperr.Error {
 			// ignore invalid error, just download it again
 			var invalidErr maxminddb.InvalidDatabaseError
 			if !errors.As(err, &invalidErr) {
-				return gperr.Wrap(err)
+				return err
 			}
 		}
 		valid = false
@@ -101,7 +100,7 @@ func (cfg *MaxMind) LoadMaxMindDB(parent task.Parent) gperr.Error {
 	if !valid {
 		cfg.Logger().Info().Msg("MaxMind DB not found/invalid, downloading...")
 		if err = cfg.download(); err != nil {
-			return ErrDownloadFailure.With(err)
+			return fmt.Errorf("%w: %w", ErrDownloadFailure, err)
 		}
 	} else {
 		cfg.Logger().Info().Msg("MaxMind DB loaded")
@@ -236,7 +235,7 @@ func (cfg *MaxMind) download() error {
 	// extract .tar.gz and to database
 	err = extractFileFromTarGz(databaseGZ, cfg.dbFilename(), tmpDBPath)
 	if err != nil {
-		return gperr.New("failed to extract database from archive").With(err)
+		return err
 	}
 
 	// test if the downloaded database is valid

internal/maxmind/types/config.go

@@ -3,7 +3,6 @@ package maxmind
 import (
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
-	gperr "github.com/yusing/goutils/errs"
 	strutils "github.com/yusing/goutils/strings"
 )
 
@@ -21,7 +20,7 @@ const (
 	MaxMindGeoIP2  DatabaseType = "geoip2"
 )
 
-func (cfg *Config) Validate() gperr.Error {
+func (cfg *Config) Validate() error {
 	if cfg.Database == "" {
 		cfg.Database = MaxMindGeoLite
 	}