Maintenance connection from aft starboard to chapel/medical/ops (#22148)

# Summary

This PR extends the maint between medical and operations into the public
hallway.
This drastically shortens the path to starboard-aft maint areas
resulting in quicker travel time and more navigation options for antags.

## Preview

<img width="846" height="695" alt="image"
src="https://github.com/user-attachments/assets/8192c5e1-b248-4a44-b557-b56a104c1b48"
/>

html/changelogs/fabiank3-mailsorting-room-maint.yml

@@ -0,0 +1,6 @@
+author: FabianK3
+
+delete-after: True
+
+changes:
+  - rscadd: "Extended the maint between ops and medical into the public hallway. This drastically shortens the way to starboard-aft maint areas from the center of the ship."