SCCV Horizon Aft Extension & Partial Remap (#21495)

**Overview:**
The first huge fuckoff mapping PR for giving the Horizon enough extra
space to be able to comfortably map on it for the duration before NBT2
and not be super cramped (extends aft by 6 turfs).

Includes a SECOND vault to heist at the back of the ship and a lot of
maint area people can repurpose. Notably, this also removes the Xenobio
Hazardous Containment room and the Medical Emergency Storage room
(contents of the latter have been moved). Otherwise, y'all got more
ship.

**Map Images (OUTDATED NOW):**
<img width="2453" height="868" alt="Screenshot 2025-10-16 141649"
src="https://github.com/user-attachments/assets/be9a540d-af92-46b4-b59f-e298204a678a"
/>
<img width="2450" height="940" alt="Screenshot 2025-10-16 141702"
src="https://github.com/user-attachments/assets/b96f3f3e-dd4b-4457-9c5c-1f09f8bb7a00"
/>
<img width="2452" height="895" alt="Screenshot 2025-10-16 141714"
src="https://github.com/user-attachments/assets/9a16e55d-8386-46d9-a3d3-d4e5a0ff6ec0"
/>

**Misc Features:**
<img width="1069" height="685" alt="Screenshot 2025-10-16 141727"
src="https://github.com/user-attachments/assets/89c14f85-f476-4f91-bd02-7c36f36a4418"
/>
<img width="983" height="825" alt="Screenshot 2025-10-16 141736"
src="https://github.com/user-attachments/assets/6b20da20-982c-4ec1-b252-3507f1211e94"
/>
<img width="1382" height="951" alt="Screenshot 2025-10-16 141743"
src="https://github.com/user-attachments/assets/fdfd683d-33a4-47e3-9df8-dec1f9286598"
/>
<img width="2405" height="863" alt="Screenshot 2025-10-16 141803"
src="https://github.com/user-attachments/assets/c539c4bd-4a8f-4326-a30b-5a1d09eca26b"
/>

**changes:**
- qol: "Hugely expands the Horizon's maints and adjusts/expands much of
the aft of the ship."
  - rscadd: "Adds a new Vault to Horizon (Deck 3 aft, behind the Gym)."
  - rscdel: "Removes Xenobiology Hazardous Specimens compartment."
  - rscdel: "Removes Medical Emergency Storage compartment."
  - spellcheck: "Replaces a few mentions of 'room' with 'compartment.'"
  - spellcheck: "Renames the Bridge Break Room to Bridge Wardroom."
  - spellcheck: "Renames the Kitchen to the Galley."
  - spellcheck: "Renames the Dining Hall to the Mess Hall."
  - spellcheck: "Renames each Washroom to the Head."

code/game/objects/random/misc.dm

@@ -509,7 +509,7 @@
 
 /obj/random/condiment
 	name = "random condiments and sauces"
-	desc = "Contains random condiments for use in the kitchen."
+	desc = "Contains random condiments for use in the galley."
 	icon_state = "condiment"
 	spawn_nothing_percentage = 10
 	problist = list(
@@ -529,8 +529,8 @@
 	)
 
 /obj/random/kitchen_staples
-	name = "random kitchen staples"
-	desc = "Contains random ingredients that are handy in the kitchen"
+	name = "random galley staples"
+	desc = "Contains random ingredients that are handy in the galley"
 	icon_state = "ingredient_bag"
 	spawn_nothing_percentage = 20
 	problist = list(