Add intelligent handling for oversized photos in Telegram service

Implements send_large_photos_as_documents parameter to handle photos
exceeding Telegram's limits (10MB file size or 10000px dimension sum).

Features:
- Automatic detection of oversized photos using file size and PIL-based
  dimension checking
- Two handling modes:
  * send_large_photos_as_documents=false (default): Intelligently
    downsizes photos using Lanczos resampling and progressive JPEG
    quality reduction to fit within Telegram limits
  * send_large_photos_as_documents=true: Sends oversized photos as
    documents to preserve original quality
- For media groups: separates oversized photos and sends them as
  documents after the main group, or downsizes them inline
- Maintains backward compatibility with existing max_asset_data_size
  parameter for hard size limits

This resolves PHOTO_INVALID_DIMENSIONS errors for large images like
26MP photos while giving users control over quality vs. file size.

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

custom_components/immich_album_watcher/services.yaml

@@ -127,3 +127,10 @@ send_telegram_notification:
           step: 1048576
           unit_of_measurement: "bytes"
           mode: box
+    send_large_photos_as_documents:
+      name: Send Large Photos As Documents
+      description: How to handle photos exceeding Telegram's limits (10MB or 10000px dimension sum). If true, send as documents. If false, downsize to fit limits.
+      required: false
+      default: false
+      selector:
+        boolean: