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/types.rs

@@ -54,6 +54,31 @@ pub struct ReactionInfo {
     pub is_chosen: bool,
 }
 
+/// Информация о медиа-контенте сообщения
+#[derive(Debug, Clone)]
+pub enum MediaInfo {
+    Photo(PhotoInfo),
+}
+
+/// Информация о фотографии в сообщении
+#[derive(Debug, Clone)]
+pub struct PhotoInfo {
+    pub file_id: i32,
+    pub width: i32,
+    pub height: i32,
+    pub download_state: PhotoDownloadState,
+    pub expanded: bool,
+}
+
+/// Состояние загрузки фотографии
+#[derive(Debug, Clone)]
+pub enum PhotoDownloadState {
+    NotDownloaded,
+    Downloading,
+    Downloaded(String),
+    Error(String),
+}
+
 /// Метаданные сообщения (ID, отправитель, время)
 #[derive(Debug, Clone)]
 pub struct MessageMetadata {
@@ -65,11 +90,13 @@ pub struct MessageMetadata {
 }
 
 /// Контент сообщения (текст и форматирование)
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone)]
 pub struct MessageContent {
     pub text: String,
     /// Сущности форматирования (bold, italic, code и т.д.)
     pub entities: Vec<TextEntity>,
+    /// Медиа-контент (фото, видео и т.д.)
+    pub media: Option<MediaInfo>,
 }
 
 /// Состояние и права доступа к сообщению
@@ -132,6 +159,7 @@ impl MessageInfo {
             content: MessageContent {
                 text: content,
                 entities,
+                media: None,
             },
             state: MessageState {
                 is_outgoing,
@@ -203,6 +231,27 @@ impl MessageInfo {
         })
     }
 
+    /// Проверяет, содержит ли сообщение фото
+    pub fn has_photo(&self) -> bool {
+        matches!(self.content.media, Some(MediaInfo::Photo(_)))
+    }
+
+    /// Возвращает ссылку на PhotoInfo (если есть)
+    pub fn photo_info(&self) -> Option<&PhotoInfo> {
+        match &self.content.media {
+            Some(MediaInfo::Photo(info)) => Some(info),
+            _ => None,
+        }
+    }
+
+    /// Возвращает мутабельную ссылку на PhotoInfo (если есть)
+    pub fn photo_info_mut(&mut self) -> Option<&mut PhotoInfo> {
+        match &mut self.content.media {
+            Some(MediaInfo::Photo(info)) => Some(info),
+            _ => None,
+        }
+    }
+
     pub fn reply_to(&self) -> Option<&ReplyInfo> {
         self.interactions.reply_to.as_ref()
     }
@@ -246,6 +295,7 @@ pub struct MessageBuilder {
     reply_to: Option<ReplyInfo>,
     forward_from: Option<ForwardInfo>,
     reactions: Vec<ReactionInfo>,
+    media: Option<MediaInfo>,
 }
 
 impl MessageBuilder {
@@ -266,6 +316,7 @@ impl MessageBuilder {
             reply_to: None,
             forward_from: None,
             reactions: Vec::new(),
+            media: None,
         }
     }
 
@@ -363,9 +414,15 @@ impl MessageBuilder {
         self
     }
 
+    /// Установить медиа-контент
+    pub fn media(mut self, media: MediaInfo) -> Self {
+        self.media = Some(media);
+        self
+    }
+
     /// Построить MessageInfo из данных builder'а
     pub fn build(self) -> MessageInfo {
-        MessageInfo::new(
+        let mut msg = MessageInfo::new(
             self.id,
             self.sender_name,
             self.is_outgoing,
@@ -380,7 +437,9 @@ impl MessageBuilder {
             self.reply_to,
             self.forward_from,
             self.reactions,
-        )
+        );
+        msg.content.media = self.media;
+        msg
     }
 }