feat: add firmware versioning and device_type support (NebuleAir/ModuleAir)
- Add VERSION file (1.0.0) and changelog.json for firmware tracking - Add device_type config param (nebuleair_pro default, backward compatible via INSERT OR IGNORE) - Add device_type select in admin.html Protected Settings - Add version badge and changelog modal in Updates section - Add get_firmware_version and get_changelog PHP endpoints - Display firmware version in update_firmware.sh after git pull Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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