refactor: migrate authentication to NextAuth and clean up related services

types/next-auth.d.ts

@@ -0,0 +1,28 @@
+import { DefaultSession } from "next-auth";
+
+declare module "next-auth" {
+  interface Session {
+    user: {
+      id: string;
+      teamId: string;
+      firstName: string;
+      lastName: string;
+    } & DefaultSession["user"];
+  }
+
+  interface User {
+    teamId: string;
+    firstName: string;
+    lastName: string;
+  }
+}
+
+declare module "next-auth/jwt" {
+  interface JWT {
+    id: string;
+    teamId: string;
+    firstName: string;
+    lastName: string;
+  }
+}
+