feat(settings): add settings management API endpoints

- Add GET /settings/get and POST /settings/set endpoints for managing system settings
- Implement config file persistence for settings changes
- Update config schema to include notification and webhook settings
- Add API documentation for new endpoints
- Move config path variables to global package for consistency

router.go

@@ -11,10 +11,12 @@ import (
 )
 
 func setupRoutes() {
-	http.HandleFunc("/system/getStatus", GetStatusHandler)
-	http.HandleFunc("/system/getSoftwareInfo", GetSoftwareInfoHandler)
 	systemLogHandler := postLog.NewLogSocketHandler(postLog.GetLogBroadcaster())
 	http.HandleFunc("/system/getLogs", systemLogHandler.Handle)
+	http.HandleFunc("/system/getStatus", GetStatusHandler)
+	http.HandleFunc("/system/getSoftwareInfo", GetSoftwareInfoHandler)
+	http.HandleFunc("/system/settings/get", handlers.GetSettingsHandler)
+	http.HandleFunc("/system/settings/set", handlers.SetSettingsHandler)
 
 	http.HandleFunc("/register", handlers.RegisterHandler)
 	http.HandleFunc("/login", handlers.LoginHandler)