fix(ci): import SLABS variable group for GITEA_TOKEN

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

codemagic.yaml

@@ -13,11 +13,12 @@ workflows:
 
     environment:
       xcode: latest
+      groups:
+        - SLABS
       vars:
         BUNDLE_ID: uk.silverlabs.silverapple
         GITEA_REPO: SilverLABS/SilverApple
         GITEA_API: https://git.silverlabs.uk/api/v1
-        # GITEA_TOKEN — set this in Codemagic App Settings → Environment variables (mark as secret)
 
     scripts:
       - name: Generate Xcode project