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>

sqlite/set_config.py

@@ -51,6 +51,7 @@ config_entries = [
     ("MPPT", "0", "bool"),
     ("NOISE", "0", "bool"),
     ("modem_version", "XXX", "str"),
+    ("device_type", "nebuleair_pro", "str"),
     ("language", "fr", "str"),
     ("wifi_power_saving", "0", "bool"),
     ("cpu_power_mode", "normal", "str")