Codeside Cargo Refactor (#20030)

**NOTE TO SYSADMINS: See "SQL Details" section below for information on
SQL modifications.**

Moves the data containing cargo items (i.e. the ones you order from ops
and get in the cargo shuttle) from the online database to the codebase.
Everything from suppliers to categories to individual items is now
code-side and editable by developers/contributors.

Refactors cargo items to use `singletons` instead of `datums` for
`cargo_supplier`, `cargo_category`, and `cargo_item`. Multiple-instnace
things like cargo_orders, etc. still use `datums`.

Fixed a bunch of strange discrepancies in categories, suppliers, and
pricing for various cargo items. I did a little bit, but it's exhausting
to go through all of it right now.

Clicking the 'Details' button on the Cargo Order app now actually gives
you details instead of bluescreening. Also added some UI elements to the
Cargo Order app - Cargo Control and Delivery remain untouched.

Overhauled the Cargo Order console TGUI window. It now has tabs on the
left, displays restricted access, supplier information, and boasts
search functionality.

### SQL Details
<details>
<summary>SQL Details [Click to Expand]</summary>

The following SQL tables should be deleted or deprecated from the server
database, as they are no longer in use:

- `ss13_cargo_items`
- `ss13_cargo_categories`
- `ss13_cargo_suppliers`

The included migration file, `V011__codeside_cargo`, creates a new table
`ss13_cargo_item_orderlog` to the DB. This **replaces**
`ss13_cargo_orderlog_items`. Because of this,
`ss13_cargo_orderlog_items` is deprecated and should either be deleted
or locked & preserved for logging purposes.

</details>

## Screenshots


![image](https://github.com/user-attachments/assets/79129923-1fb6-4cee-ac8d-5505a52270a4)

![image](https://github.com/user-attachments/assets/a323be35-8ce6-4ec4-98f7-ee701d0931a3)

![image](https://github.com/user-attachments/assets/5ddb02c5-152f-4715-b2da-20903fa11c93)

![image](https://github.com/user-attachments/assets/420e45b0-6a9f-4420-beb8-a2c8423a5be4)

![image](https://github.com/user-attachments/assets/114f4755-ee51-41e6-8670-07aacc5326ae)

---------

Signed-off-by: naut <55491249+nauticall@users.noreply.github.com>
Co-authored-by: Fluffy <65877598+FluffyGhoster@users.noreply.github.com>

code/modules/modular_computers/file_system/programs/civilian/cargo_order.dm

@@ -12,7 +12,7 @@
 	ui_auto_update = FALSE
 
 	var/page = "main" //main - Main Menu, order - Order Page, item_details - Item Details Page, tracking - Tracking Page
-	var/selected_category = "" // Category that is currently selected
+	var/selected_category = null // Category that is currently selected
 	var/selected_item = "" // Path of the currently selected item
 	var/datum/cargo_order/co
 	var/status_message //Status Message to be displayed to the user
@@ -34,6 +34,9 @@
 	data["order_value"] = co.get_value(0)
 	data["order_item_count"] = co.get_item_count()
 
+	if(!selected_category)
+		selected_category = SScargo.get_default_category()
+
 	//Pass Data for Main page
 	if(page == "main")
 		//Pass all available categories and the selected category
@@ -98,14 +101,14 @@
 
 			co.set_submitted(GetNameAndAssignmentFromId(I), usr.character_id, reason)
 			status_message = "Order submitted successfully. Order ID: [co.order_id] Tracking code: [co.get_tracking_code()]"
-			//TODO: Print a list with the order data
+
 			co = null
 			return TRUE
 
 		//Add item to the order list
 		if("add_item")
 			var/datum/cargo_order_item/coi = new
-			var/datum/cargo_item/ci = SScargo.cargo_items[params["add_item"]]
+			var/singleton/cargo_item/ci = SScargo.cargo_items[params["add_item"]]
 			if(ci)
 				coi.ci = ci
 				coi.calculate_price()