Document login client ID setting for OAuth invite flow

[shannonbradshaw]

Source changes

• viamrobotics/app#11652 (APP-15958): Added a Login client ID field to the organization settings white-labeling page. The field designates which registered OAuth app is used for the login and invite flow.
• Backend behavior change: previously, any registered OAuth app would be used automatically as the FusionAuth login client (the first one in the ClientIDs array). Now, LoginClientID must be set explicitly; otherwise invite links fall back to Viam's default login screen.
• Invite flow branding: when a user opens an organization invite link, the organization's logo URL is now passed to the FusionAuth login screen as a logo_url query parameter.

Docs changes

• docs/organization/oauth.md: Added a new ## Designate a login client ID section after "Set up auth app" covering:
  • The UI navigation path (organization dropdown → Settings and invites → White Labeling → Login client ID).
  • The validation rules (client ID must match a registered OAuth app; the app must include the invite redirect URI).
  • The effect on invite flow behavior (branded login screen with organization logo when set, Viam default login when empty).

How I found these

• Xref lookup: no direct xref match for LoginClientID; the OAuth setup flow lives in docs/organization/oauth.md.
• Grep matches: LoginClientID and login client ID found zero matches in docs; FusionAuth matched 4 files, only oauth.md is about OAuth setup.
• Searched ClientIDs, client_ids, OAuthLoginClientID in docs (zero matches).
• Verified the field label in app/ui/src/routes/(auth-required)/organization/[org_id]/settings/white-labeling.svelte reads Login client ID under the White Labeling heading.

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