ha: add carefree_bt12 integration for the Carefree Connects awning

Commands reverse-engineered from Bluetooth HCI snoop captures (adb bugreport)
of the official Carefree Connects (BT12) Android app, confirmed across three
independent captures including two isolated single-action live tests:
extend/retract (feature 0x05, values 0x01/0x02 -- the device toggles motor
state internally, there's no separate stop byte) and light on/off (feature
0x1a, values 0x19/0x01). Both live under GATT characteristic 02060002 on
service 02060001-50e1-405f-bab0-6bb582b4d96e.

Connects on demand per command (mirrors the app's own connect/act/disconnect
pattern) rather than holding a persistent connection like li3_battery, since
this device doesn't stream telemetry. Cover/light state is assumed/optimistic
-- the notify channel (02060003) isn't decoded yet, so a diagnostic sensor
just surfaces raw undecoded replies to build up data for that follow-on work.

Verified end-to-end against the real device: light on/off and awning
extend both worked through Home Assistant.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

ha/custom_components/carefree_bt12/__init__.py

@@ -0,0 +1,25 @@
+"""The Carefree Connects BT12 awning integration."""
+from __future__ import annotations
+
+from homeassistant.config_entries import ConfigEntry
+from homeassistant.const import Platform
+from homeassistant.core import HomeAssistant
+
+from .const import DOMAIN
+from .coordinator import Bt12Coordinator
+
+PLATFORMS: list[Platform] = [Platform.COVER, Platform.LIGHT, Platform.SENSOR]
+
+
+async def async_setup_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    coordinator = Bt12Coordinator(hass, entry.data["address"])
+    hass.data.setdefault(DOMAIN, {})[entry.entry_id] = coordinator
+    await hass.config_entries.async_forward_entry_setups(entry, PLATFORMS)
+    return True
+
+
+async def async_unload_entry(hass: HomeAssistant, entry: ConfigEntry) -> bool:
+    unload_ok = await hass.config_entries.async_unload_platforms(entry, PLATFORMS)
+    if unload_ok:
+        hass.data[DOMAIN].pop(entry.entry_id)
+    return unload_ok