Update EP v2 docs for support bundle limit and invite checklist (#4101)

* Update EP v2 docs for support bundle 2GB limit and invite checklist

- Add 2GB upload limit note to support bundles section with SDK API
  fallback for larger bundles
- Document the new checklist option for sending EP invites during
  customer creation

* Fix invite docs: clarify v2 enrollment checkbox behavior

The checkbox sets portal version, not invite delivery. Only visible
to admins in mixed mode. Customers default to Classic when unchecked.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: AmberAlston

docs/vendor/enterprise-portal-v2-invite.mdx

@@ -27,6 +27,8 @@ To invite a customer's end user to the portal:
 
 You can also enable **Automatically invite customer email to Enterprise Portal on creation** so that every new customer with an email address receives an invite automatically.
 
+For vendors in mixed mode (both Classic and New enabled), the customer creation screen includes a **Use new Enterprise Portal for this customer** checkbox. When checked, the customer is enrolled in the New portal and any auto-invite email points them to the New portal URL instead of Classic. This checkbox is only visible to team admins. When unchecked or not visible, new customers default to Classic.
+
 ## Removing users
 
 To remove a user from a customer's portal team:

docs/vendor/enterprise-portal-v2-use.mdx

@@ -76,7 +76,7 @@ Customer team admins can manage their portal team from the Team Settings page:
 Customers can generate and upload support bundles from the portal:
 
 - **Generate bundles**: Follow the instructions on the Support Bundles page to generate a diagnostic bundle from their Linux or Helm installation
-- **Upload bundles**: Upload an existing bundle file for vendor analysis
+- **Upload bundles**: Upload an existing bundle file for vendor analysis. The maximum upload size is 2 GB. For larger bundles, use the [Replicated SDK API](/reference/replicated-sdk-apis#post-supportbundle) upload endpoint, which has no size restriction.
 - **View history**: See previously uploaded bundles and their status
 
 ## License information