feat: add device UUID pairing — unique identity per ESP-phone pair

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- Firmware: auto-generate 16-byte UUID on first boot (NVS), new READ characteristic
- BLE name: AtomS3R-Relay → SylDa_Server
- KEY? now returns DEVICE_ID + HMAC_KEY, SET_ID command for UUID provisioning
- App: UUID+HMAC loaded from prefs, scan by service UUID, verify UUID after connect
- UUID mismatch → disconnect + skip address + rescan
- Key conflict dialog: keep ESP keys, overwrite ESP (with checkbox confirm), or cancel
- NO_KEY with existing app keys: send existing pair instead of generating new
- Added design spec doc

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eddy 2026-07-29 18:12:13 +02:00

parent 73b3c0eaa0

commit 348c55d830

9 changed files with 527 additions and 106 deletions

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