Zeng-Hu Mind Shielding (#21996)

This PR was requested by @Fyniiy and @nauticall for the _A Dream for
Tomorrow_ lore arc, as one of two new options for the crew to take when
dealing with ADPI in the Lemurian Sea. As a new lore development,
Zeng-Hu Pharmaceuticals has begun offering their own take on Mind
Blankers (previously a bioaug invented by the Federal Technocracy of
Galatea) as a commercial product marketed towards SCC employees
traveling into the Lemurian Sea. These implants were previously
restricted only to Galatean Humans and Offworlders, but are now expanded
in availability to any Psi-sensitive species (So not including Diona,
Vaurca, and IPCs).

https://wiki.aurorastation.org/index.php/Lemurian_Sea

<img width="1616" height="765" alt="image"
src="https://github.com/user-attachments/assets/ff16606d-acfb-4c84-b06a-2ab4d97e3138"
/>

code/modules/cargo/items/medical.dm

@@ -802,3 +802,11 @@
 	container_type = "crate"
 	groupable = TRUE
 	spawn_amount = 1
+
+/singleton/cargo_item/organcooler/mind_blanker
+	name = "mind blanker cooler"
+	description = "An organ cooler containing a single Zeng-Hu Mind Blanker. Their cost has been subsidized by ZH for Operation Deep Dive."
+	price = 500
+	items = list(
+		/obj/item/storage/box/unique/freezer/organcooler/mind_blanker
+	)