feat: 重构会话管理逻辑，添加获取当前话题的方法，简化命令处理中的会话获取逻辑

src/command/handlers/switch_session.rs

@@ -108,23 +108,3 @@ async fn handle_switch_session(
         .with_metadata("title", &topic.title)
         .with_metadata("message_count", &topic.message_count.to_string()))
 }
-
-fn format_time_ago(timestamp_ms: i64) -> String {
-    let now = std::time::SystemTime::now()
-        .duration_since(std::time::UNIX_EPOCH)
-        .unwrap()
-        .as_millis() as i64;
-
-    let diff_ms = now - timestamp_ms;
-    let diff_secs = diff_ms / 1000;
-
-    if diff_secs < 60 {
-        "just now".to_string()
-    } else if diff_secs < 3600 {
-        format!("{} mins ago", diff_secs / 60)
-    } else if diff_secs < 86400 {
-        format!("{} hours ago", diff_secs / 3600)
-    } else {
-        format!("{} days ago", diff_secs / 86400)
-    }
-}

src/gateway/cli_session.rs

@@ -20,6 +20,7 @@ impl CliSessionService {
     }
 
     /// 创建指定通道的会话
+    #[allow(dead_code)]
     pub(crate) fn create_with_channel(
         &self,
         channel_name: &str,
@@ -30,12 +31,14 @@ impl CliSessionService {
             .map_err(|err| AgentError::Other(format!("create session error: {}", err)))
     }
 
+    #[allow(dead_code)]
     pub(crate) fn get(&self, session_id: &str) -> Result<Option<SessionRecord>, AgentError> {
         self.store
             .get_session(session_id)
             .map_err(|err| AgentError::Other(format!("get session error: {}", err)))
     }
 
+    #[allow(dead_code)]
     pub(crate) fn list(&self, include_archived: bool) -> Result<Vec<SessionRecord>, AgentError> {
         self.store
             .list_sessions("cli", include_archived)
@@ -43,6 +46,7 @@ impl CliSessionService {
     }
 
     /// 列出指定通道的会话
+    #[allow(dead_code)]
     pub(crate) fn list_by_channel(
         &self,
         channel_name: &str,
@@ -53,24 +57,28 @@ impl CliSessionService {
             .map_err(|err| AgentError::Other(format!("list sessions error: {}", err)))
     }
 
+    #[allow(dead_code)]
     pub(crate) fn rename(&self, session_id: &str, title: &str) -> Result<(), AgentError> {
         self.store
             .rename_session(session_id, title)
             .map_err(|err| AgentError::Other(format!("rename session error: {}", err)))
     }
 
+    #[allow(dead_code)]
     pub(crate) fn archive(&self, session_id: &str) -> Result<(), AgentError> {
         self.store
             .archive_session(session_id)
             .map_err(|err| AgentError::Other(format!("archive session error: {}", err)))
     }
 
+    #[allow(dead_code)]
     pub(crate) fn delete(&self, session_id: &str) -> Result<(), AgentError> {
         self.store
             .delete_session(session_id)
             .map_err(|err| AgentError::Other(format!("delete session error: {}", err)))
     }
 
+    #[allow(dead_code)]
     pub(crate) fn clear_messages(&self, session_id: &str) -> Result<(), AgentError> {
         self.store
             .clear_messages(session_id)

src/gateway/processor.rs

@@ -145,13 +145,10 @@ impl InboundProcessor {
         // 计算正确的 session_id（根据 channel_name 和 chat_id）
         let session_id = persistent_session_id(&inbound.channel, &inbound.chat_id);
 
-        // 获取当前话题（如果有 Session）
-        let current_topic = if let Some(session) = self.session_manager.get(&inbound.channel).await {
-            let guard = session.lock().await;
-            guard.current_topic(&inbound.chat_id).map(|s| s.to_string())
-        } else {
-            None
-        };
+        // 获取当前话题（封装了 session 创建逻辑）
+        let current_topic = self.session_manager
+            .get_current_topic(&inbound.channel, &inbound.chat_id)
+            .await?;
 
         // 使用 ChannelInputAdapter 尝试解析命令
         let adapter = ChannelInputAdapter::new();

src/gateway/runtime.rs

@@ -11,7 +11,7 @@ use crate::storage::{
 };
 use crate::tools::{
     DefaultSubAgentRuntime, InMemoryTaskRepository, NoopSessionMessageSender,
-    SessionMessageSender, SubAgentRuntime, SubAgentRuntimeConfig, ToolRegistry,
+    SessionMessageSender, SubAgentRuntimeConfig, ToolRegistry,
 };
 
 use super::agent_factory::AgentFactory;
@@ -89,7 +89,6 @@ pub(crate) fn build_session_manager_with_sender(
         scheduler_jobs,
         skill_events.clone(),
         session_message_sender.clone(),
-        conversations.clone(),
         known_agents,
         default_timezone,
         disabled_tools,

src/gateway/session.rs

@@ -547,6 +547,17 @@ impl SessionManager {
         self.lifecycle.get(channel_name).await
     }
 
+    /// 获取指定 chat 的当前话题（确保 session 存在）
+    pub async fn get_current_topic(&self, channel_name: &str, chat_id: &str) -> Result<Option<String>, AgentError> {
+        self.ensure_session(channel_name).await?;
+        if let Some(session) = self.get(channel_name).await {
+            let guard = session.lock().await;
+            Ok(guard.current_topic(chat_id).map(|s| s.to_string()))
+        } else {
+            Ok(None)
+        }
+    }
+
     /// 更新最后活跃时间
     pub async fn touch(&self, channel_name: &str) {
         self.lifecycle.touch(channel_name).await;

src/gateway/tool_registry_factory.rs

@@ -3,7 +3,7 @@ use std::sync::Arc;
 
 use crate::config::TaskConfig;
 use crate::skills::SkillRuntime;
-use crate::storage::{ConversationRepository, MemoryRepository, SchedulerJobRepository, SkillEventRepository};
+use crate::storage::{MemoryRepository, SchedulerJobRepository, SkillEventRepository};
 use crate::tools::{
     BashTool, CalculatorTool, FileEditTool, FileReadTool, FileWriteTool,
     HttpRequestTool, MemoryManageTool, MemorySearchTool,
@@ -18,7 +18,6 @@ pub(crate) struct ToolRegistryFactory {
     scheduler_jobs: Arc<dyn SchedulerJobRepository>,
     skill_events: Arc<dyn SkillEventRepository>,
     session_message_sender: Arc<dyn SessionMessageSender>,
-    conversations: Arc<dyn ConversationRepository>,
     known_agents: HashSet<String>,
     default_timezone: String,
     disabled_tools: HashSet<String>,
@@ -33,7 +32,6 @@ impl ToolRegistryFactory {
         scheduler_jobs: Arc<dyn SchedulerJobRepository>,
         skill_events: Arc<dyn SkillEventRepository>,
         session_message_sender: Arc<dyn SessionMessageSender>,
-        conversations: Arc<dyn ConversationRepository>,
         known_agents: HashSet<String>,
         default_timezone: String,
         disabled_tools: HashSet<String>,
@@ -45,7 +43,6 @@ impl ToolRegistryFactory {
             scheduler_jobs,
             skill_events,
             session_message_sender,
-            conversations,
             known_agents,
             default_timezone,
             disabled_tools,

src/tools/task/runtime.rs

@@ -13,7 +13,7 @@ use crate::tools::{ToolContext, ToolRegistry};
 use super::error::TaskError;
 use super::prompt::{extract_summary, SubagentPromptBuilder};
 use super::repository::TaskRepository;
-use super::types::{SubagentType, TaskDefinition, TaskHandle, TaskSession, TaskSessionState, TaskToolResult};
+use super::types::{SubagentType, TaskDefinition, TaskSession, TaskToolResult};
 
 /// 子代理运行时配置
 #[derive(Debug, Clone)]