feat(infra): rename packaging container to KNELCloudron-packaging and add TODO tracking

- Rename packaging container from tsys-cloudron-packaging to KNELCloudron-packaging
- Update image reference to git.knownelement.com/knel/knelcloudron-packaging:latest
- Add TODO.md with active tasks and backlog items
- Add todo-generate.sh and todo-update.sh helper scripts
- Update PackagingForCloudronWorkspace/README.md with workspace details

scripts/packaging-exec.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 set -euo pipefail
-NAME=${PACKAGING_CONTAINER_NAME:-tsys-cloudron-packaging}
+NAME=${PACKAGING_CONTAINER_NAME:-KNELCloudron-packaging}
 
 if [[ $# -lt 1 ]]; then
   echo "Usage: scripts/packaging-exec.sh <command...>" >&2
@@ -12,4 +12,3 @@ if ! docker ps --format '{{.Names}}' | grep -qx "$NAME"; then
 fi
 
 exec docker exec -it "$NAME" sh -lc "$*"
-