feat(deploy): add deploy script and per-device config files

deploy/deploy.sh — automated deploy: arch detection, scp .app, write
seed.json, verify. Supports single laptop, list, or "all"; --seed-only
flag skips .app copy for key-rotation runs.

deploy/devices.conf — all 19 laptops (num / IP / event_device_id).
deploy/event.env.example — template for gitignored event.env (API key).

README updated: deploy/ table, script usage, manual steps moved to
reference section.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitignore

@@ -27,3 +27,4 @@ aether_native_app_config.json
 # package-lock.json
 builds/
 resources/seed_config.json
+event.env