v1.2.0: HACS-Kompatibilität, App-Icon, bereinigte Konfiguration

- manifest.json: codeowners, documentation, issue_tracker, mdi:matrix icon
- hacs.json: homeassistant-Feld entfernt (gehört in manifest.json)
- brand/: icon.png, icon@2x.png, dark_icon.png, dark_icon@2x.png hinzugefügt
- icon/icon.svg: Matrix-Chat SVG-Icon hinzugefügt
- generate_icons.py: PNG-Generator für brand/-Verzeichnis

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

custom_components/matrix_messenger/manifest.json

@@ -1,12 +1,15 @@
 {
   "domain": "matrix_messenger",
   "name": "Matrix Messenger",
-  "codeowners": [],
+  "version": "1.2.0",
   "config_flow": true,
-  "documentation": "",
-  "homeassistant": "2026.4.0",
-  "iot_class": "cloud_push",
+  "documentation": "https://github.com/CeddysHomeAssistant/Matrix-Server",
+  "issue_tracker": "https://github.com/CeddysHomeAssistant/Matrix-Server/issues",
+  "codeowners": ["@CeddysHomeAssistant"],
   "requirements": ["matrix-nio[e2e]>=0.21.0"],
-  "version": "1.1.0",
-  "integration_type": "hub"
+  "dependencies": [],
+  "iot_class": "cloud_push",
+  "integration_type": "hub",
+  "homeassistant": "2026.4.0",
+  "icon": "mdi:matrix"
 }