Perf: Batch systemd queries in list_executions endpoints

Replace per-VM systemd D-Bus calls with a single batch query using
ListUnits(). This reduces the number of D-Bus calls from O(n) to O(1)
for persistent VMs, significantly improving response times on CRNs
with many instances.

- Add get_services_active_states() method to SystemDManager that
  queries all service states in one ListUnits() call
- Add _get_executions_running_states() helper in views to pre-fetch
  all running states efficiently
- Update list_executions and list_executions_v2 to use batch query

Fix: added a comment to clarify the replace action

Fix: Add rombar=0 to GPU passthrough to prevent boot hangs with incom…

…patible GPU firmware

Fix: Removed line on Readme file

HaProxy make SSH routing possible

HaProxy Certbots make certificate challange possible without stopping…

… haproxy

Improve the haconfig file

Better readability
Better fallback use

Fixed docs url with the new one

Fix wrong variable being used when fetching from aggregate

Fix reserved space calculation