Refactor billing services with new AccountsApi

The billing services have been refactored to use the new AccountsApi and TeamAccountsApi. All methods that were previously defined in each billing service, including getting customer ID, getting permissions, etc., have been transferred to these APIs. This change improves the modularity and organization of the code.

apps/web/app/(dashboard)/home/(user)/_lib/server/load-user-workspace.ts

@@ -0,0 +1,44 @@
+import { cache } from 'react';
+
+import { createAccountsApi } from '@kit/accounts/api';
+import { getSupabaseServerComponentClient } from '@kit/supabase/server-component-client';
+
+import featureFlagsConfig from '~/config/feature-flags.config';
+
+const shouldLoadAccounts = featureFlagsConfig.enableTeamAccounts;
+
+/**
+ * @name loadUserWorkspace
+ * @description
+ * Load the user workspace data. It's a cached per-request function that fetches the user workspace data.
+ * It can be used across the server components to load the user workspace data.
+ */
+export const loadUserWorkspace = cache(async () => {
+  const client = getSupabaseServerComponentClient();
+  const api = createAccountsApi(client);
+
+  const accountsPromise = shouldLoadAccounts
+    ? () => api.loadUserAccounts()
+    : () => Promise.resolve([]);
+
+  const workspacePromise = api.getAccountWorkspace();
+  const userPromise = client.auth.getUser();
+
+  const [accounts, workspace, userResult] = await Promise.all([
+    accountsPromise(),
+    workspacePromise,
+    userPromise,
+  ]);
+
+  const user = userResult.data.user;
+
+  if (!user) {
+    throw new Error('User is not logged in');
+  }
+
+  return {
+    accounts,
+    workspace,
+    user,
+  };
+});