Updated dependencies, Added Hosted mode for Stripe checkout

* chore: bump version to 3.1.0 and update dependencies in package.json, pnpm-lock.yaml, and pnpm-workspace.yaml; enhance billing services with support for hosted checkout page in Stripe integration

* Enhance error handling in billing services to log error messages instead of objects; update documentation for Stripe integration to clarify publishable key requirements based on UI mode.

packages/billing/stripe/src/schema/stripe-client-env.schema.ts

@@ -1,11 +1,19 @@
 import * as z from 'zod';
 
+const isHostedMode = process.env.STRIPE_UI_MODE === 'hosted_page';
+
 export const StripeClientEnvSchema = z
   .object({
-    publishableKey: z.string().min(1),
+    publishableKey: isHostedMode
+      ? z.string().optional()
+      : z.string().min(1),
   })
   .refine(
     (schema) => {
+      if (isHostedMode || !schema.publishableKey) {
+        return true;
+      }
+
       return schema.publishableKey.startsWith('pk_');
     },
     {