tower 0.61.9 — Phase I tenant-neutral export bundle

Bundles now emit odoosky.export.v3 schema with a recipe sub-object
and explicit provenance section. The `source` field is dropped from
addon entries (the Phase I tenant leak we identified). Readers handle
both v2 and v3 schemas; v2 bundles in flight stay restorable but their
addon `source` field is silently ignored at restore time.

Phase I closes the export-bundle side of the cross-tenant data leak.

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: "0.61.8"
+    tag: "0.61.9"
     pullPolicy: IfNotPresent
   imagePullSecrets:
     - name: docker-mirror-pull