Initial release: Matrix Messenger Home Assistant integration

- Config flow (GUI): Homeserver, Passwort- oder Token-Anmeldung, Raumauswahl
- E2EE-Unterstützung via matrix-nio mit SQLite Key-Store
- Aktionen: send_message, ask_question (Text + Emoji-Reaktion)
- notify.*-Entitäten pro Raum
- Optionaler Hintergrund-Sync, 30-Min-Timeout für Fragen
- HACS-kompatibel, HA >= 2026.4.0

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

custom_components/matrix_messenger/const.py

@@ -0,0 +1,21 @@
+"""Constants for Matrix Messenger integration."""
+DOMAIN = "matrix_messenger"
+
+CONF_HOMESERVER = "homeserver"
+CONF_AUTH_METHOD = "auth_method"
+CONF_USERNAME = "username"
+CONF_PASSWORD = "password"
+CONF_ACCESS_TOKEN = "access_token"
+CONF_DEVICE_ID = "device_id"
+CONF_DEVICE_NAME = "device_name"
+CONF_ROOMS = "rooms"
+CONF_ENABLE_SYNC = "enable_sync"
+
+AUTH_METHOD_PASSWORD = "password"
+AUTH_METHOD_TOKEN = "token"
+
+DEFAULT_DEVICE_NAME = "Home Assistant Matrix Messenger"
+DEFAULT_SYNC_INTERVAL = 5
+DEFAULT_QUESTION_TIMEOUT = 1800
+
+EVENT_MATRIX_RESPONSE = "matrix_messenger_response"