svc-bkp-rmt-2-loc: migrate pull script to Python + add unit tests; lock down backup-provider ACLs

- Replace Bash pull-specific-host.sh with Python pull-specific-host.py (argparse, identical logic)
- Update role vars and runner template to call python script
- Add __init__.py files for test discovery/imports
- Add unittest: tests/unit/roles/svc-bkp-rmt-2-loc/files/test_pull_specific_host.py (mocks subprocess/os/time; covers success, no types, find-fail, retry-exhaustion)
- Backup provider SSH wrapper: align allowed ls path (backup-docker-to-local)
- Split user role tasks: 01_core (sudoers), 02_permissions_ssh (SSH keys + wrapper), 03_permissions_folders (ownership + default ACLs + depth-limited chown/chmod)
- Ensure default ACLs grant rwx to 'backup' and none to group/other; keep sudo rsync working

Ref: ChatGPT discussion (2025-10-14) — https://chatgpt.com/share/68ee920a-9b98-800f-8806-ddcfe0255149

roles/sys-bkp-provider-user/files/ssh-wrapper.sh

@@ -13,7 +13,7 @@ get_backup_types="find /Backups/$hashed_machine_id/ -maxdepth 1 -type d -execdir
 
 
 # @todo This configuration is not scalable yet. If other backup services then sys-ctl-bkp-docker-2-loc are integrated, this logic needs to be optimized
-get_version_directories="ls -d /Backups/$hashed_machine_id/sys-ctl-bkp-docker-2-loc/*"
+get_version_directories="ls -d /Backups/$hashed_machine_id/backup-docker-to-local/*"
 last_version_directory="$($get_version_directories | tail -1)"
 rsync_command="sudo rsync --server --sender -blogDtpre.iLsfxCIvu . $last_version_directory/"