ship: tower 0.56.0 -> 0.56.1 (substrate version surfacing fix)

The original 0.56.0 backend image had a stripped-binary ldflag quirk that left the substrate endpoint reporting tower=dev. b25ffbe switches to TOWER_VERSION env (chart-injected from image tag) — this bump rolls the pod onto the new image so the env-var path takes effect.

Frontend stays at 0.56.0 — nothing changed there.

values.yaml

@@ -9,7 +9,7 @@ backend:
     # so every cluster that runs Tower needs the same imagePullSecret
     # provisioned out-of-band (until cluster-platform-v3 owns it).
     repository: registry.odoosky.cloud/odoosky/docker-mirror/tower
-    tag: "0.56.0"
+    tag: "0.56.1"
     pullPolicy: IfNotPresent
   imagePullSecrets:
     - name: docker-mirror-pull