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
 }