feat(dashboard): add transactions and users management pages with CRUD functionality

feat(auth): implement login page and authentication middleware
feat(sidebar): create sidebar component with user info and navigation links
feat(api): establish API client for interacting with backend services

apps/web/lib/auth-client.ts

@@ -0,0 +1,9 @@
+import { createAuthClient } from "better-auth/react";
+import { adminClient, usernameClient } from "better-auth/client/plugins";
+
+export const authClient = createAuthClient({
+  baseURL: process.env.NEXT_PUBLIC_CSMS_URL ?? "http://localhost:3001",
+  plugins: [usernameClient(), adminClient()],
+});
+
+export const { signIn, signOut, signUp, useSession } = authClient;