ship: tower + tower-ui 0.55.0 -> 0.56.0

Bumps both image tags to 0.56.0 — the cumulative release of:
- argocd doAuth refactor + 4 tests
- instance lifecycle service extraction (179a/b/c) + 13 tests
- server lifecycle service (188a/b/c/e) + Disconnect + Teardown + 19 tests
- capability gates on lifecycle endpoints (197)
- tenant_filter + lockout primitive tests (180)
- tenant column + filter on Backups + Activity (172)
- Tenant Detail cockpit (173)

Backend tests 1 -> 58. Charter compliance pass.

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: "0.55.0"
+    tag: "0.56.0"
     pullPolicy: IfNotPresent
   imagePullSecrets:
     - name: docker-mirror-pull
@@ -29,7 +29,7 @@ frontend:
   enabled: true
   image:
     repository: registry.odoosky.cloud/odoosky/docker-mirror/tower-ui
-    tag: "0.55.0"
+    tag: "0.56.0"
     pullPolicy: IfNotPresent
   imagePullSecrets:
     - name: docker-mirror-pull