Refactor join service and fix imports

Join service was deleted and its functionality was integrated into the team-accounts API. General rearrangement and renaming of server-related files were made, particularly for billing-related services to ensure consistency. This made it necessary to fix import paths across multiple files.

apps/web/app/(dashboard)/home/(user)/billing/_lib/server/server-actions.ts

@@ -0,0 +1,34 @@
+'use server';
+
+import { redirect } from 'next/navigation';
+
+import { enhanceAction } from '@kit/next/actions';
+import { getSupabaseServerActionClient } from '@kit/supabase/server-actions-client';
+
+import { PersonalAccountCheckoutSchema } from '../schema/personal-account-checkout.schema';
+import { UserBillingService } from './user-billing.service';
+
+/**
+ * @name createPersonalAccountCheckoutSession
+ * @description Creates a checkout session for a personal account.
+ */
+export const createPersonalAccountCheckoutSession = enhanceAction(
+  async function (data) {
+    const service = new UserBillingService(getSupabaseServerActionClient());
+
+    return await service.createCheckoutSession(data);
+  },
+  {
+    schema: PersonalAccountCheckoutSchema,
+  },
+);
+
+/**
+ * @description Creates a billing Portal session for a personal account
+ */
+export async function createPersonalAccountBillingPortalSession() {
+  const service = new UserBillingService(getSupabaseServerActionClient());
+  const url = await service.createBillingPortalSession();
+
+  return redirect(url);
+}