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/translations/en.json

@@ -195,7 +195,7 @@
         },
         "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).",
             "fields": {
                 "bot_token": {
                     "name": "Bot Token",
@@ -207,7 +207,7 @@
                 },
                 "urls": {
                     "name": "URLs",
-                    "description": "List of media URLs with type (photo/video). If empty, sends a text message. Large lists are automatically split into multiple media groups."
+                    "description": "List of media URLs with optional type (document/photo/video, default: document) and optional content_type (MIME type). If empty, sends a text message. Photos and videos can be grouped; documents are sent separately."
                 },
                 "caption": {
                     "name": "Caption",