fix: test connection reads form values instead of saved config

The "Kapcsolat tesztelése" button sent an empty POST to /settings/test,
which read from the (possibly empty) config file on disk. Now sends the
current form values so testing works before clicking Save.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -107,11 +107,11 @@ volumes:
 
 ## Building
 
-On the build server (192.168.0.180):
+On the build server (kisfenyo@192.168.0.180):
 
 ```bash
 cd ~/build/recipe-importer
-./build.sh 0.1.0 --push
+./build.sh X.X.X --push
 ```
 
 ## Web UI