feat: remove appwrite and add nextjs backend

backend/src/auth/decorator/getUser.decorator.ts

@@ -0,0 +1,9 @@
+import { createParamDecorator, ExecutionContext } from "@nestjs/common";
+
+export const GetUser = createParamDecorator(
+  (data: string, ctx: ExecutionContext) => {
+    const request = ctx.switchToHttp().getRequest();
+    const user = request.user;
+    return data ? user?.[data] : user;
+  }
+);