Fix OS update reboot, boot confirmation and repeated downloads

[bcbetterninja]

Pi OS updates could install successfully but fail to reboot because reboot received two arguments instead of the required single 0 tryboot argument. Unpaired x86/Pi clients also failed to confirm healthy trial boots, allowing a later reboot to return to the old OS and download the update again.

This change makes the signed bundle wait for successful RAUC activation before rebooting, confirms healthy pairing screens, and persists the client attempt and RAUC metadata across root-slot changes. Startup and paired updates share bounded attempts; installed or uncertain outcomes block automatic reinstallation. Channel changes do not kill an in-flight RAUC transaction or delete its bundle. BF preserves the attempted version, reports rollback/errors, and exposes retry controls and pairing-screen diagnostics without requiring a shell.

The bundle carries the reboot repair for upgrades from 0.318/1.0.0. Already published v1.0.0 bundles remain unchanged; deployment requires a new OS release after merge. No signing keys or client lockdown permissions change. This branch also includes the existing four-line Android SDK setup fix from PR #11, needed because master still requests the removed SDK tools package.

Validation:

• 8 Rust lifecycle tests pass in a lightweight harness compiling the actual Linux update modules.
• 10 mocked boot/RAUC tests pass, including exact Pi reboot arguments, failed activation, daemon restart, late confirmation and state migration; wired into CI.
• Server suite: 109 passed, 1 PostgreSQL integration test skipped locally; server CI with PostgreSQL also passed.
• TypeScript, shell syntax and diff checks pass.
• Full Linux client, server/PostgreSQL and boot-safety CI pass on review follow-up 61abe69; see PR checks for remaining platform results. Physical Pi/x86 update, reboot and power-loss testing has not been performed.

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