Add opt-in demo pairing and tenant display defaults

[bcbetterninja]

Adds opt-in demo pairing using the normal kiosk enrollment and playback flow. Demo is disabled by default; enabling it provisions a dedicated tenant with editable sample content. Android/TV, Linux and Windows show a Demo control during pairing and an Exit demo control that clears local enrollment without a server deletion request.

Tenant settings now define layouts assigned once to every newly created display, plus an optional default active layout. Administrator changes to existing display assignments are preserved. A bounded cleanup job uses normal kiosk deletion when a demo kiosk reaches 24 hours old or misses heartbeats for five minutes.

This implements the simplified scope agreed for #16: no update suppression, assignment enforcement, server-side exit endpoint, or automatic demo re-enrollment. Configuration and reviewer instructions are in docs/demo-mode.md.

Validation:

• Server build and TypeScript check pass.
• All 148 server tests pass with PostgreSQL, including demo enrollment isolation/idempotency, provisioning preservation, generic display defaults and cleanup thresholds.
• Shared Rust core and Android bridge tests pass, including demo contract/backward compatibility coverage.
• Added Android instrumentation coverage for demo enrollment through normal playback and local-only exit.
• PR CI passes for native Linux and Windows clients, Android (including instrumentation), server, deployment, and ioBOX.

Closes #16.

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