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/logging/accesslog/config.go

@@ -1,11 +1,11 @@
 package accesslog
 
 import (
+	"errors"
 	"net/http"
 	"time"
 
 	"github.com/yusing/godoxy/internal/serialization"
-	gperr "github.com/yusing/goutils/errs"
 )
 
 type (
@@ -58,9 +58,9 @@ var (
 	ReqLoggerFormats = []Format{FormatCommon, FormatCombined, FormatJSON}
 )
 
-func (cfg *ConfigBase) Validate() gperr.Error {
+func (cfg *ConfigBase) Validate() error {
 	if cfg.Path == "" && !cfg.Stdout {
-		return gperr.New("path or stdout is required")
+		return errors.New("path or stdout is required")
 	}
 	return nil
 }

internal/logging/accesslog/file_access_logger.go

@@ -1,6 +1,7 @@
 package accesslog
 
 import (
+	"fmt"
 	"io"
 	"net/http"
 	"sync"
@@ -11,7 +12,6 @@ import (
 	"github.com/rs/zerolog"
 	"github.com/rs/zerolog/log"
 	maxmind "github.com/yusing/godoxy/internal/maxmind/types"
-	gperr "github.com/yusing/goutils/errs"
 	ioutils "github.com/yusing/goutils/io"
 	strutils "github.com/yusing/goutils/strings"
 	"github.com/yusing/goutils/synk"
@@ -161,9 +161,9 @@ func (l *fileAccessLogger) Rotate(result *RotateResult) (rotated bool, err error
 
 func (l *fileAccessLogger) handleErr(err error) {
 	if l.errRateLimiter.Allow() {
-		gperr.LogError("failed to write access log", err, &l.logger)
+		l.logger.Err(err).Msg("failed to write access log")
 	} else {
-		gperr.LogError("too many errors, stopping access log", err, &l.logger)
+		l.logger.Err(err).Msg("too many errors, stopping access log")
 		l.task.Finish(err)
 	}
 }
@@ -234,7 +234,7 @@ func (l *fileAccessLogger) write(data []byte) {
 	if err != nil {
 		l.handleErr(err)
 	} else if n < len(data) {
-		l.handleErr(gperr.Errorf("%w, writing %d bytes, only %d written", io.ErrShortWrite, len(data), n))
+		l.handleErr(fmt.Errorf("%w, writing %d bytes, only %d written", io.ErrShortWrite, len(data), n))
 	}
 	atomic.AddInt64(&l.writeCount, int64(n))
 }

internal/logging/accesslog/filter.go

@@ -1,12 +1,13 @@
 package accesslog
 
 import (
+	"errors"
+	"fmt"
 	"net"
 	"net/http"
 	"strings"
 
 	nettypes "github.com/yusing/godoxy/internal/net/types"
-	gperr "github.com/yusing/goutils/errs"
 	strutils "github.com/yusing/goutils/strings"
 )
 
@@ -29,7 +30,7 @@ type (
 	} // @name CIDR
 )
 
-var ErrInvalidHTTPHeaderFilter = gperr.New("invalid http header filter")
+var ErrInvalidHTTPHeaderFilter = errors.New("invalid http header filter")
 
 func (f *LogFilter[T]) CheckKeep(req *http.Request, res *http.Response) bool {
 	if len(f.Values) == 0 {
@@ -59,7 +60,7 @@ func (k *HTTPHeader) Parse(v string) error {
 		split = append(split, "")
 	case 2:
 	default:
-		return ErrInvalidHTTPHeaderFilter.Subject(v)
+		return fmt.Errorf("%w: %s", ErrInvalidHTTPHeaderFilter, v)
 	}
 	k.Key = split[0]
 	k.Value = split[1]

internal/logging/accesslog/retention.go

@@ -1,10 +1,10 @@
 package accesslog
 
 import (
+	"errors"
 	"fmt"
 	"strconv"
 
-	gperr "github.com/yusing/goutils/errs"
 	strutils "github.com/yusing/goutils/strings"
 )
 
@@ -15,8 +15,8 @@ type Retention struct {
 } // @name LogRetention
 
 var (
-	ErrInvalidSyntax = gperr.New("invalid syntax")
-	ErrZeroValue     = gperr.New("zero value")
+	ErrInvalidSyntax = errors.New("invalid syntax")
+	ErrZeroValue     = errors.New("zero value")
 )
 
 // see back_scanner_test.go#L210 for benchmarks
@@ -34,7 +34,7 @@ var defaultChunkSize = 32 * kilobyte
 func (r *Retention) Parse(v string) (err error) {
 	split := strutils.SplitSpace(v)
 	if len(split) != 2 {
-		return ErrInvalidSyntax.Subject(v)
+		return fmt.Errorf("%w: %s", ErrInvalidSyntax, v)
 	}
 	switch split[0] {
 	case "last":
@@ -64,7 +64,7 @@ func (r *Retention) Parse(v string) (err error) {
 		case "GB":
 			r.KeepSize = n * gigabyte
 		default:
-			return ErrInvalidSyntax.Subject("unit " + split[1])
+			return fmt.Errorf("%w: unit %s", ErrInvalidSyntax, split[1])
 		}
 	}
 	if !r.IsValid() {

internal/logging/accesslog/status_code_range.go

@@ -1,6 +1,8 @@
 package accesslog
 
 import (
+	"errors"
+	"fmt"
 	"strconv"
 
 	gperr "github.com/yusing/goutils/errs"
@@ -12,7 +14,7 @@ type StatusCodeRange struct {
 	End   int
 } // @name StatusCodeRange
 
-var ErrInvalidStatusCodeRange = gperr.New("invalid status code range")
+var ErrInvalidStatusCodeRange = errors.New("invalid status code range")
 
 func (r *StatusCodeRange) Includes(code int) bool {
 	return r.Start <= code && code <= r.End
@@ -25,7 +27,7 @@ func (r *StatusCodeRange) Parse(v string) error {
 	case 1:
 		start, err := strconv.Atoi(split[0])
 		if err != nil {
-			return gperr.Wrap(err)
+			return err
 		}
 		r.Start = start
 		r.End = start
@@ -40,7 +42,7 @@ func (r *StatusCodeRange) Parse(v string) error {
 		r.End = end
 		return nil
 	default:
-		return ErrInvalidStatusCodeRange.Subject(v)
+		return fmt.Errorf("%w: %s", ErrInvalidStatusCodeRange, v)
 	}
 }