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/net/gphttp/middleware/captcha/README.md

@@ -249,7 +249,7 @@ The package includes an embedded HTML template (`captcha.html`) that renders the
 ## Error Handling
 
 ```go
-var ErrCaptchaVerificationFailed = gperr.New("captcha verification failed")
+var ErrCaptchaVerificationFailed = errors.New("captcha verification failed")
 
 // Verification errors are logged with request details
 log.Warn().Err(err).Str("url", r.URL.String()).Str("remote_addr", r.RemoteAddr).Msg("failed to verify captcha")

internal/net/gphttp/middleware/captcha/provider.go

@@ -1,10 +1,9 @@
 package captcha
 
 import (
+	"errors"
 	"net/http"
 	"time"
-
-	gperr "github.com/yusing/goutils/errs"
 )
 
 type Provider interface {
@@ -16,4 +15,4 @@ type Provider interface {
 	FormHTML() string
 }
 
-var ErrCaptchaVerificationFailed = gperr.New("captcha verification failed")
+var ErrCaptchaVerificationFailed = errors.New("captcha verification failed")