refactor(global): move config to global package and consolidate handlers

- Move Config struct and related functions to global package
- Consolidate handler utilities into utils package
- Remove deprecated handlers and instance packages
- Add new handlers package with settings and proxy functionality
- Update config.json to include watchdog enabled flag

service/service.go

@@ -9,27 +9,17 @@ import (
 	"strconv"
 	"strings"
 
-	"super-frpc/config"
 	"super-frpc/database"
+	"super-frpc/global"
 	"super-frpc/postLog"
 )
 
 func GetConfigDir() (string, error) {
-	cfg, err := config.GetConfig()
-	if err != nil {
-		postLog.Error(fmt.Sprintf("[GetConfigDir] Failed to get config: %v", err))
-		return "", err
-	}
-	return cfg.InstancePath, nil
+	return global.CurrentConfig.InstancePath, nil
 }
 
 func GetFrpcPath() (string, error) {
-	cfg, err := config.GetConfig()
-	if err != nil {
-		postLog.Error(fmt.Sprintf("[GetFrpcPath] Failed to get config: %v", err))
-		return "", err
-	}
-	return cfg.FrpcPath, nil
+	return global.CurrentConfig.FrpcPath, nil
 }
 
 func GetInitSystem() string {