feat: complete migration to config flow and bugfixes (@38decibel)

* feat: migrate to config flow with device registry and brand icons

- Migrate all platforms to async_setup_entry (config flow)
- Each device now appears as a real HA device in the device registry
- Add device_info to all entities (cover, switch, button, sensor, binary_sensor)
- Add config_flow.py with airsend.yaml + !secret resolution
- Add strings.json for UI labels
- Fix unique_id bug (was splitting each character of the name)
- Split binary_sensor.py from sensor.py
- Bump version to 4.0

* Add icon for local brand

* Revise installation steps for AirSend integration

* Correction du crash websocket

raise Exception remplacé par return False

* Update README with AirSend configuration steps

Added instructions for configuring AirSend in Home Assistant.

* Update README with clearer instructions for YAML

Clarified instructions for editing the airsend.yaml file.

* Add files via upload

* Add English translation for AirSend configuration

* Add fr translations

* Update screenshot following latest version

* Fixe unavailable and new type light

Corrections de bugs
500 avec wait: true non fatal

Nouveau type
light.py — lumière dimmable (type 4100)

README.md

@@ -15,6 +15,15 @@ Component for sending radio commands through the AirSend (RF433) or AirSend duo
    - Select your devices, for local connection, select `spurl`
    - Click `Export YAML` to save the airsend.yaml
    - In the `config` folder of Home Assistant, place the `airsend.yaml` file.
+   - Edit the file and add these lines
+     ```yaml
+     devices:
+       ...
+       AirSend Box:
+         type: 0
+         spurl: !secret spurl
+         sensors: true
+     ```    
 
 3. **Edit the `secrets.yaml` File**:
    - Add a line to the `secrets.yaml` file with the AirSend - Local IP - / - Password - (and IPv4 address).
@@ -30,19 +39,13 @@ Component for sending radio commands through the AirSend (RF433) or AirSend duo
      ```
    - Replace `**************` with the AirSend Password, `fe80::xxxx:xxxx:xxxx:xxxx` with AirSend Local IP and `192.168.xxx.xxx` with the AirSend IPv4 address.
 
-4. **Edit the `configuration.yaml` File**:
-   - Add the following line to the `configuration.yaml` file to include the `airsend.yaml` file:
-     ```yaml
-     airsend: !include airsend.yaml
-     ```
-
-5. **Install the Custom Component**:
+4. **Install the Custom Component**:
    - In the Home Assistant terminal, run the following command to install the component:
      ```bash
      wget -q -O - https://raw.githubusercontent.com/devmel/hass_airsend/master/install | bash -
      ```
 
-6. **Restart Home Assistant and the AirSend Addon**:
+5. **Restart Home Assistant and the AirSend Addon**:
    - Restart Home Assistant.
    - Restart the AirSend addon.