Make patterns puchasable with stripe (#1313)

## Description:
Patterns now show how much each skin costs and can be purchased

* Refactored logic out of TerritoryPatternsModal and into Cosmetics.ts
* Role gated cosmetics are not shown if you don't have the role. This is
to prevent people trying to get roles just for the cosmetics.
* Added purchasable cosmetics.
* On purchase the backend adds the flare to the player account

<img width="1197" alt="Screenshot 2025-07-01 at 11 45 52 AM"
src="https://github.com/user-attachments/assets/b4b4b7ea-f5f4-4c61-9ced-b608f75aa9d7"
/>

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors

## Please put your Discord username so you can be contacted if a bug or
regression is found:

evan

tests/util/TestServerConfig.ts

@@ -4,6 +4,9 @@ import { GameMapType } from "../../src/core/game/Game";
 import { GameID } from "../../src/core/Schemas";
 
 export class TestServerConfig implements ServerConfig {
+  stripePublishableKey(): string {
+    throw new Error("Method not implemented.");
+  }
   cloudflareConfigPath(): string {
     throw new Error("Method not implemented.");
   }