重构：斜杠命令通过 handle_message 处理，Channel 不再管理 Session

架构优化：
- Feishu 渠道的 handle_and_publish 简化为只发布消息到 bus
- Session 创建/复用由 SessionManager 在 handle_message 内部处理
- 斜杠命令检测移到 handle_message，execute_slash_command 直接调用
- CLI 和 Feishu 统一通过消息总线处理斜杠命令

src/channels/feishu.rs

@@ -12,9 +12,7 @@ use tokio::sync::{broadcast, RwLock};
 
 use crate::bus::{MessageBus, MediaItem, OutboundMessage};
 use crate::channels::base::{Channel, ChannelError};
-use crate::channels::slash_command::parse_slash_command;
 use crate::config::FeishuChannelConfig;
-use crate::session::{SessionCommand, SessionEvent};
 
 const FEISHU_API_BASE: &str = "https://open.feishu.cn/open-apis";
 const FEISHU_WS_BASE: &str = "https://open.feishu.cn";
@@ -2003,94 +2001,8 @@ impl Channel for FeishuChannel {
         bus: &Arc<MessageBus>,
         msg: &crate::bus::InboundMessage,
     ) -> Result<(), ChannelError> {
-        use tokio::sync::mpsc;
-
-        if !self.is_allowed(&msg.sender_id) {
-            tracing::warn!(
-                channel = %self.name(),
-                sender = %msg.sender_id,
-                "Access denied"
-            );
-            return Ok(());
-        }
-
-        // Check for slash command
-        if let Some((cmd_name, cmd_args)) = parse_slash_command(&msg.content) {
-            tracing::info!(cmd = %cmd_name, "Feishu slash command detected");
-
-            // For slash commands, we need to ensure a session exists first
-            // Get or create session via control plane
-            let (reply_tx, mut reply_rx) = mpsc::channel(1);
-            bus.publish_control(crate::bus::ControlMessage {
-                op: SessionCommand::CreateDialog {
-                    channel: msg.channel.clone(),
-                    chat_id: msg.chat_id.clone(),
-                    title: None,
-                },
-                reply_tx,
-            }).await?;
-
-            // Wait for session creation
-            let session_id = match reply_rx.recv().await {
-                Some(Ok(SessionEvent::DialogCreated { session_id, .. })) => Some(session_id),
-                _ => None,
-            };
-
-            // Now execute the slash command with the session
-            let (cmd_reply_tx, mut cmd_reply_rx) = mpsc::channel(1);
-            bus.publish_control(crate::bus::ControlMessage {
-                op: SessionCommand::ExecuteSlashCommand {
-                    command: cmd_name.to_string(),
-                    args: if cmd_args.is_empty() { None } else { Some(cmd_args.to_string()) },
-                    channel: msg.channel.clone(),
-                    chat_id: msg.chat_id.clone(),
-                    current_session_id: session_id,
-                },
-                reply_tx: cmd_reply_tx,
-            }).await?;
-
-            // Handle response
-            if let Some(result) = reply_rx.recv().await {
-                match result {
-                    Ok(SessionEvent::SlashCommandExecuted { message, .. }) => {
-                        let outbound = crate::bus::OutboundMessage {
-                            channel: msg.channel.clone(),
-                            chat_id: msg.chat_id.clone(),
-                            content: message,
-                            reply_to: None,
-                            media: vec![],
-                            metadata: msg.forwarded_metadata.clone(),
-                        };
-                        bus.publish_outbound(outbound).await?;
-                    }
-                    Ok(SessionEvent::Error { message, .. }) => {
-                        let outbound = crate::bus::OutboundMessage {
-                            channel: msg.channel.clone(),
-                            chat_id: msg.chat_id.clone(),
-                            content: message,
-                            reply_to: None,
-                            media: vec![],
-                            metadata: msg.forwarded_metadata.clone(),
-                        };
-                        bus.publish_outbound(outbound).await?;
-                    }
-                    Err(e) => {
-                        let outbound = crate::bus::OutboundMessage {
-                            channel: msg.channel.clone(),
-                            chat_id: msg.chat_id.clone(),
-                            content: format!("Error: {}", e),
-                            reply_to: None,
-                            media: vec![],
-                            metadata: msg.forwarded_metadata.clone(),
-                        };
-                        bus.publish_outbound(outbound).await?;
-                    }
-                    _ => {}
-                }
-            }
-            return Ok(());
-        }
-
+        // All messages (including slash commands) go through the normal inbound flow
+        // SessionManager handles session creation/reuse internally
         bus.publish_inbound(msg.clone()).await?;
         Ok(())
     }

src/session/session.rs

@@ -6,6 +6,7 @@ use tokio::sync::{Mutex, mpsc};
 use uuid::Uuid;
 
 use crate::bus::ChatMessage;
+use crate::channels::slash_command::parse_slash_command;
 use crate::config::LLMProviderConfig;
 use crate::agent::{AgentLoop, AgentError, ContextCompressor};
 use crate::agent::system_prompt::build_system_prompt;
@@ -517,6 +518,29 @@ impl SessionManager {
         let unified_id = UnifiedSessionId::new(channel, chat_id, dialog_id);
         let session = self.get_or_create_session(&unified_id).await?;
 
+        // Check for slash command
+        if let Some((cmd_name, cmd_args)) = parse_slash_command(content) {
+            let (new_session_id, response) = self.execute_slash_command(
+                cmd_name,
+                if cmd_args.is_empty() { None } else { Some(cmd_args) },
+                channel,
+                chat_id,
+                Some(&unified_id),
+            ).await?;
+
+            // If a new session was created (e.g., /new, /delete), update the session binding
+            if let Some(new_id) = new_session_id {
+                // Update the session in the map with the new ID
+                let mut inner = self.inner.lock().await;
+                if let Some(old_session) = inner.sessions.remove(&unified_id.to_string()) {
+                    inner.sessions.insert(new_id.to_string(), old_session);
+                }
+            }
+
+            return Ok(response);
+        }
+
+        // Normal message handling through LLM
         let response: String = {
             let mut session_guard = session.lock().await;