Users blocking now rely on UUID rather than ID

This way, if a user A blocks another user B, if user B refreshes the browser or leaves and re-enters the room, user B will still be blocked.
As a side effect, this allows us to completely remove the "sockets" property in the SocketManager on the Pusher.

front/src/Phaser/Game/PlayerInterface.ts

@@ -1,9 +1,10 @@
-import type {BodyResourceDescriptionInterface} from "../Entity/PlayerTextures";
+import type { BodyResourceDescriptionInterface } from "../Entity/PlayerTextures";
 
 export interface PlayerInterface {
     userId: number;
     name: string;
     characterLayers: BodyResourceDescriptionInterface[];
-    visitCardUrl: string|null;
-    companion: string|null;
+    visitCardUrl: string | null;
+    companion: string | null;
+    userUuid: string;
 }