feat: add isEnterpriseCloud field and update billing logic

- Introduced `isEnterpriseCloud` boolean field in the user schema to differentiate enterprise users.
- Updated billing UI to display specific information for enterprise cloud users, including a dedicated section for managing subscriptions.
- Modified API webhook logic to handle subscription updates and server management based on the `isEnterpriseCloud` status.

packages/server/src/db/schema/user.ts

@@ -65,6 +65,7 @@ export const user = pgTable("user", {
 	stripeCustomerId: text("stripeCustomerId"),
 	stripeSubscriptionId: text("stripeSubscriptionId"),
 	serversQuantity: integer("serversQuantity").notNull().default(0),
+	isEnterpriseCloud: boolean("isEnterpriseCloud").notNull().default(false),
 	trustedOrigins: text("trustedOrigins").array(),
 	bookmarkedTemplates: text("bookmarkedTemplates")
 		.array()