初步集成消息通道，支持Telegram + Lark机器人

src-tauri/src/chat_channel/traits.rs

@@ -0,0 +1,53 @@
+use async_trait::async_trait;
+use tokio::sync::mpsc;
+
+use super::error::ChatChannelError;
+use super::types::*;
+
+#[async_trait]
+pub trait ChatChannelBackend: Send + Sync + 'static {
+    fn channel_type(&self) -> ChannelType;
+
+    /// Start the receiving loop. `command_tx` forwards incoming IM messages
+    /// to the central command dispatcher.
+    async fn start(
+        &self,
+        command_tx: mpsc::Sender<IncomingCommand>,
+    ) -> Result<(), ChatChannelError>;
+
+    /// Stop the backend connection gracefully.
+    async fn stop(&self) -> Result<(), ChatChannelError>;
+
+    /// Current connection status.
+    async fn status(&self) -> ChannelConnectionStatus;
+
+    /// Send a plain text message.
+    async fn send_message(&self, text: &str) -> Result<SentMessageId, ChatChannelError>;
+
+    /// Send a rich/structured message (Telegram Markdown / Lark Card).
+    async fn send_rich_message(
+        &self,
+        message: &RichMessage,
+    ) -> Result<SentMessageId, ChatChannelError>;
+
+    /// [Phase 2] Send an interactive message with action buttons.
+    /// Default implementation degrades to send_rich_message.
+    async fn send_interactive_message(
+        &self,
+        message: &InteractiveMessage,
+    ) -> Result<SentMessageId, ChatChannelError> {
+        self.send_rich_message(&message.to_rich_fallback()).await
+    }
+
+    /// [Phase 2] Update an already-sent message (e.g., permission status change).
+    async fn update_message(
+        &self,
+        _message_id: &SentMessageId,
+        _message: &RichMessage,
+    ) -> Result<(), ChatChannelError> {
+        Ok(())
+    }
+
+    /// Test the connection (used by "Test Connection" button in UI).
+    async fn test_connection(&self) -> Result<(), ChatChannelError>;
+}