Aurora Messenger v0.2.2-pre

Onboarding now ends on a permission gate that explains each permission and blocks entry until the two delivery-critical ones are granted - Notifications and Run in the background (battery/Doze exemption). These are the permissions whose absence made a fresh install silently fail to receive a pairing handshake.

• Microphone (voice messages/calls) and Camera (QR scanning, video calls) are optional and requested on first use.
• Sharing photos/videos uses Android's system picker, so there is no gallery permission to grant.
• Also adds a rendezvous /health liveness endpoint powering the new status page.

Full notes in CHANGELOG.md.

Pre-alpha - Android 10+ - sideload. Please don't rely on it for sensitive communication yet.