feat: implement user session management with Redis and add game token verification

app/game-api/src/trpc.ts

@@ -1,4 +1,4 @@
-import { initTRPC } from '@trpc/server';
+import { initTRPC, TRPCError } from '@trpc/server';
 
 import type { GameApiContext } from './context.js';
 
@@ -6,3 +6,17 @@ const t = initTRPC.context<GameApiContext>().create();
 
 export const router = t.router;
 export const procedure = t.procedure;
+export const authedProcedure = t.procedure.use(({ ctx, next }) => {
+    if (!ctx.auth) {
+        throw new TRPCError({
+            code: 'UNAUTHORIZED',
+            message: 'Unauthorized',
+        });
+    }
+    return next({
+        ctx: {
+            ...ctx,
+            auth: ctx.auth,
+        },
+    });
+});