feat: implement Phase 11 — inline photo viewing with ratatui-image

Add feature-gated (`images`) inline photo support:
- New types: MediaInfo, PhotoInfo, PhotoDownloadState, ImagesConfig
- Media module: ImageCache (LRU filesystem cache), ImageRenderer (terminal protocol detection)
- Photo metadata extraction from TDLib MessagePhoto with download_file() API
- ViewImage command (v/м) to toggle photo expand/collapse in message selection
- Two-pass UI rendering: placeholder lines in message bubbles + StatefulImage overlay
- Collapse all expanded photos on Esc (exit selection mode)

Dependencies: ratatui-image 8.1, image 0.25 (optional, behind `images` feature flag)

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

src/tdlib/messages/convert.rs

@@ -13,7 +13,7 @@ impl MessageManager {
     pub(crate) async fn convert_message(&self, msg: &TdMessage) -> Option<MessageInfo> {
         use crate::tdlib::message_conversion::{
             extract_content_text, extract_entities, extract_forward_info,
-            extract_reactions, extract_reply_info, extract_sender_name,
+            extract_media_info, extract_reactions, extract_reply_info, extract_sender_name,
         };
 
         // Извлекаем все части сообщения используя вспомогательные функции
@@ -23,6 +23,7 @@ impl MessageManager {
         let forward_from = extract_forward_info(msg);
         let reply_to = extract_reply_info(msg);
         let reactions = extract_reactions(msg);
+        let media = extract_media_info(msg);
 
         let mut builder = MessageBuilder::new(MessageId::new(msg.id))
             .sender_name(sender_name)
@@ -65,6 +66,10 @@ impl MessageManager {
 
         builder = builder.reactions(reactions);
 
+        if let Some(media) = media {
+            builder = builder.media(media);
+        }
+
         Some(builder.build())
     }