refactor(config): remove unused ActiveConfig

internal/config/types/config.go

@@ -2,7 +2,6 @@ package config
 
 import (
 	"regexp"
-	"sync/atomic"
 
 	"github.com/go-playground/validator/v10"
 	"github.com/yusing/godoxy/agent/pkg/agent"
@@ -42,14 +41,6 @@ type (
 	}
 )
 
-// nil-safe
-var ActiveConfig atomic.Pointer[Config]
-
-func init() {
-	cfg := DefaultConfig()
-	ActiveConfig.Store(&cfg)
-}
-
 func Validate(data []byte) gperr.Error {
 	var model Config
 	return serialization.UnmarshalValidateYAML(data, &model)