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.

cmd/main.go

@@ -16,7 +16,6 @@ import (
 	"github.com/yusing/godoxy/internal/logging/memlogger"
 	"github.com/yusing/godoxy/internal/net/gphttp/middleware"
 	"github.com/yusing/godoxy/internal/route/rules"
-	gperr "github.com/yusing/goutils/errs"
 	"github.com/yusing/goutils/task"
 	"github.com/yusing/goutils/version"
 )
@@ -64,9 +63,9 @@ func main() {
 	if err != nil {
 		var criticalErr config.CriticalError
 		if errors.As(err, &criticalErr) {
-			gperr.LogFatal("critical error in config", criticalErr)
+			log.Fatal().Err(criticalErr).Msg("critical error in config")
 		}
-		gperr.LogWarn("errors in config", err)
+		log.Warn().Err(err).Msg("errors in config")
 	}
 
 	if err := auth.Initialize(); err != nil {