docs: add organization invitation Management API guide

[onderay]

Description (required)

Adds a dedicated guide for inviting people into a Kinde organization from your own application with the Management API, covering create, list, get, and revoke, plus send_email vs delivering invite_link yourself.

This change also:

• Documents prerequisites (Allow invitations, invite application with an Application login URI) and the M2M scopes create:organization_invites, read:organization_invites, and delete:organization_invites.
• Explains role keys vs role objects in the response, sender resolution when Kinde sends the email, listing/pagination filters, and that there is no resend endpoint.
• Notes directory-sync and duplicate-member/pending-invite limits, and how invited users can sign up even when self sign-up is off.
• Cross-links the new page from the org self-serve portal, access policies, add/edit users, and the invitations webhook docs, and clarifies when to use the webhook instead.

Related issues & labels (optional)

• Closes #
• Suggested label: New doc

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Supersedes #803, which GitHub closed automatically when the source branch was renamed from t3code/docs-organization-invitation-guides to update/docs-organization-invitation-guides. Same commit, no content changes.

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📥 Commits

Reviewing files that changed from the base of the PR and between ef41ded and 2d3334e.

📒 Files selected for processing (5)

• src/content/docs/build/self-service-portal/self-serve-portal-for-orgs.mdx
• src/content/docs/build/set-up-options/access-policies.mdx
• src/content/docs/manage-users/add-and-edit/add-and-edit-users.mdx
• src/content/docs/manage-users/add-and-edit/invite-users-to-org.mdx
• src/content/docs/manage-users/add-and-edit/send-invitations-webhook.mdx

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