Add document type and content_type support for send_telegram_notification

- Add type: document as default media type (instead of photo)
- Add optional content_type field for explicit MIME type specification
- Documents are sent separately (Telegram API limitation for media groups)
- Default content types: image/jpeg (photo), video/mp4 (video), auto-detect (document)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

custom_components/immich_album_watcher/services.yaml

@@ -131,7 +131,7 @@ get_assets:
 
 send_telegram_notification:
   name: Send Telegram Notification
-  description: Send a notification to Telegram (text, photo, video, or media group).
+  description: Send a notification to Telegram (text, photo, video, document, or media group).
   target:
     entity:
       integration: immich_album_watcher
@@ -151,7 +151,7 @@ send_telegram_notification:
         text:
     urls:
       name: URLs
-      description: List of media URLs to send. Each item should have 'url' and 'type' (photo/video). If empty, sends a text message. Large lists are automatically split into multiple media groups.
+      description: "List of media URLs to send. Each item should have 'url', optional 'type' (document/photo/video, default: document), and optional 'content_type' (MIME type, e.g., 'image/jpeg'). If empty, sends a text message. Photos and videos can be grouped; documents are sent separately."
       required: false
       selector:
         object: