Enhance Telegram service with multi-format support and chunking

Renamed send_telegram_media_group to send_telegram_notification with expanded capabilities:
- Text messages (when urls is empty)
- Single photo/video (uses sendPhoto/sendVideo APIs)
- Media groups (uses sendMediaGroup API)
- Automatic chunking for unlimited media URLs
- Smart optimization: single-item chunks use appropriate single-item APIs

New parameters:
- max_group_size (2-10, default 10): control items per media group
- chunk_delay (0-60000ms, default 0): delay between chunks for rate limiting
- disable_web_page_preview: disable link previews in text messages

The service now intelligently selects the most efficient Telegram API endpoint based on content type and chunk size, with comprehensive error handling and logging.

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

custom_components/immich_album_watcher/services.yaml

@@ -25,9 +25,9 @@ get_recent_assets:
           max: 100
           mode: slider
 
-send_telegram_media_group:
-  name: Send Telegram Media Group
-  description: Send specified media URLs to a Telegram chat as a media group.
+send_telegram_notification:
+  name: Send Telegram Notification
+  description: Send a notification to Telegram (text, photo, video, or media group).
   target:
     entity:
       integration: immich_album_watcher
@@ -47,13 +47,13 @@ send_telegram_media_group:
         text:
     urls:
       name: URLs
-      description: List of media URLs to send (max 10). Each item should have 'url' and 'type' (photo/video).
-      required: true
+      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.
+      required: false
       selector:
         object:
     caption:
       name: Caption
-      description: Optional caption for the media group (applied to first item).
+      description: Caption text. For media, applied to first item. For empty URLs, this is the message text.
       required: false
       selector:
         text:
@@ -65,3 +65,31 @@ send_telegram_media_group:
       selector:
         number:
           mode: box
+    disable_web_page_preview:
+      name: Disable Web Page Preview
+      description: Disable link previews in text messages.
+      required: false
+      selector:
+        boolean:
+    max_group_size:
+      name: Max Group Size
+      description: Maximum number of media items per media group (2-10). Large lists will be split into multiple groups.
+      required: false
+      default: 10
+      selector:
+        number:
+          min: 2
+          max: 10
+          mode: slider
+    chunk_delay:
+      name: Chunk Delay
+      description: Delay in milliseconds between sending multiple media groups (0-60000). Useful for rate limiting.
+      required: false
+      default: 0
+      selector:
+        number:
+          min: 0
+          max: 60000
+          step: 100
+          unit_of_measurement: "ms"
+          mode: slider