Implement basic shop functionality for game server-specific items

[niekcandaele]

Implement basic shop functionality

Context

We need to implement a basic shop functionality that allows players to purchase items specific to their game server using virtual currency.

Requirements

• The shop should be game server-specific
• Only items should be available for purchase in this initial version
• The shop should use virtual currency for transactions

Implementation Details

• Add a new section in the UI for the shop
• Create API endpoints for fetching available items and processing purchases
• Implement the logic for handling virtual currency transactions
• Ensure that purchased items are correctly added to the player's inventory in-game

Notes

• This is part of the first phase of shop implementation
• Future phases may include more complex features like roles or real money transactions, but these are out of scope for now
• Consider adding a hook system for flexible actions upon purchase (e.g., setting roles, applying buffs) in future iterations

[niekcandaele]

This is already implemented :)