Allow organization display names to be changed

[darylkang]

Organization display names are currently fixed after organization creation. Please add a self-service setting that lets organization administrators change the display name without changing the organization slug.

Display names and slugs serve different purposes: the display name is human-facing branding, while the slug is a stable identifier. Correcting capitalization, updating branding, or reflecting a company rename should not require deleting and recreating an organization or contacting support.

Expected behavior:

• Organization administrators can edit the display name in organization settings.
• Changing the display name does not modify the organization slug, project slugs, domains, integrations, or deployment state.
• The change is validated and recorded in the audit log.