feat: Add config flow for SmartIR integration with multi-step UI wizard

- Implemented a new config flow in `config_flow.py` for SmartIR, allowing users to select platforms, controllers, and devices through a guided interface.
- Added support for new device codes in `codes_index.json` for Apton and Andersson manufacturers.
- Enhanced fan, light, and media player components to support setup from config entries.
- Introduced `strings.json` and `translations/en.json` for improved localization of the configuration steps.
- Created a tool `build_index.py` to rebuild the `codes_index.json` from individual device JSON files.
- Updated `smartir_capture.py` to handle single-code modes and excluded modes for better device configuration.
- Added `iot_class` and `config_flow` attributes in `manifest.json` to support the new configuration flow.

custom_components/smartir/manifest.json

@@ -7,6 +7,8 @@
   "requirements": ["aiofiles>=0.6.0"],
   "homeassistant": "2025.5.0",
   "version": "1.18.1",
+  "config_flow": true,
+  "iot_class": "assumed_state",
   "updater": {
     "version": "1.18.1",
     "releaseNotes": "-- Implements new async_track_state_change_event",