v0.16.8

Fixed

• Integration loads again on Home Assistant 2026.7+ (#34) — HA 2026.7 ships av>=17, and no release of aiortc (a pymediasoup dependency) supports it yet, so the required pymediasoup package became uninstallable and the whole integration failed to set up. The live-video dependencies are now optional: they are no longer listed in the manifest requirements, and every stream entry point checks their availability first — start_camera_preview() skips the auto-on request entirely (the physical intercom is never woken up for a stream that cannot start), FCM-triggered stream starts are ignored with a WARNING, and turning the camera on logs a clear per-entity message. Everything except live video/audio keeps working: doorbell detection, door opening, visitor photo, F1, call guard, DND, photo caller, and call history. On HA ≤ 2026.6 live video can be restored by installing pymediasoup manually (see README); the hard requirement will return once aiortc supports av>=17. Contributed by @kikorr (#35).