Adding NT Rep Satchel (#5329)

## About The Pull Request

NT Rep is a sad role with no fancy backpack, so I've added one.

## Why It's Good For The Game

Lack of fashion is a crime.

## Proof Of Testing

<details>
<summary>Screenshots/Videos</summary>
<img width="273" height="402" alt="image"
src="https://github.com/user-attachments/assets/cd2ef80d-8ce7-4c6a-9ce0-921f0adec4b1"
/>
<img width="184" height="202" alt="image"
src="https://github.com/user-attachments/assets/66996cdd-0008-4ca9-8744-936a8e82a588"
/>
<img width="233" height="279" alt="image"
src="https://github.com/user-attachments/assets/247b89ae-8820-4794-8050-97bfd8c9b2e8"
/>
<img width="163" height="220" alt="image"
src="https://github.com/user-attachments/assets/4364fa03-c3d4-43c4-b8d4-f1d4e3308581"
/>
<img width="151" height="206" alt="image"
src="https://github.com/user-attachments/assets/5830b2ae-8aa8-4ea2-9132-d676c54de6f9"
/>
<img width="417" height="185" alt="image"
src="https://github.com/user-attachments/assets/71a8fc35-ecaa-41d7-8947-2e22474683a4"
/>
<img width="272" height="178" alt="image"
src="https://github.com/user-attachments/assets/ef175f8c-b338-4278-9630-9bec20222824"
/>
Inhand: 
<img width="133" height="174" alt="image"
src="https://github.com/user-attachments/assets/abfcaab4-5824-47df-810f-5bd0f906473f"
/>





</details>

## Changelog

🆑
add: Added a NT themed satchel in the NT Rep locker
/🆑

modular_skyrat/modules/nanotrasen_rep/code/clothing.dm

@@ -104,3 +104,10 @@
 /obj/item/clothing/gloves/combat/naval/nanotrasen_consultant
 	name = "\improper CentCom gloves"
 	desc = "A high quality pair of thick gloves covered in gold stitching."
+
+/obj/item/storage/backpack/satchel/nanotrasen
+	name = "nanotrasen satchel"
+	desc = "An expensive green branded Nanotrasen satchel."
+	icon = 'modular_zubbers/icons/obj/storage/backpack.dmi'
+	worn_icon = 'modular_zubbers/icons/mob/clothing/back/backpack.dmi'
+	icon_state = "satchel-nanotrasen"

modular_skyrat/modules/nanotrasen_rep/code/nanotrasen_consultant.dm

@@ -148,6 +148,7 @@
 /obj/structure/closet/secure_closet/nanotrasen_consultant/PopulateContents()
 	..()
 	new /obj/item/storage/backpack/satchel/leather(src)
+	new /obj/item/storage/backpack/satchel/nanotrasen(src)
 	new /obj/item/clothing/neck/petcollar(src)
 	new /obj/item/pet_carrier(src)
 	new /obj/item/clothing/suit/armor/vest(src)