fix(ci): change Docker Hub namespace from pezkuwichain/ to pezkuwi/

Docker Hub personal account namespace must match the username.
Updated all docker.io image references across workflows, actions,
docker-compose files, and zombienet configs.

docker/dockerfiles/pezkuwi/docker-compose-local.yml

@@ -6,7 +6,7 @@ services:
       - "9933:9933"
       - "9944:9944"
       - "9615:9615"
-    image: pezkuwichain/pezkuwi:latest
+    image: pezkuwi/pezkuwi:latest
     volumes:
       - "pezkuwi-data-alice:/data"
     command: |
@@ -24,7 +24,7 @@ services:
       - "9935:9933"
       - "9945:9944"
       - "29615:9615"
-    image: pezkuwichain/pezkuwi:latest
+    image: pezkuwi/pezkuwi:latest
     volumes:
       - "pezkuwi-data-bob:/data"
     links: