feat: 添加 SessionFactory 模块，重构 SessionPool 以优化会话创建逻辑

Co-authored-by: Copilot <copilot@github.com>

src/gateway/mod.rs

@@ -5,6 +5,7 @@ pub mod memory_maintenance;
 pub mod processor;
 pub mod prompt;
 pub mod session;
+pub mod session_factory;
 pub mod session_pool;
 pub mod ws;
 

src/gateway/session.rs

@@ -32,6 +32,7 @@ use super::memory_maintenance::{
     MemoryMaintenanceModelOutput, MemoryMaintenanceScopeResult, MemoryMaintenanceService,
 };
 use super::prompt::load_agent_prompt;
+use super::session_factory::SessionFactory;
 use super::session_pool::SessionPool;
 
 fn preview_text(content: &str, max_chars: usize) -> String {
@@ -678,14 +679,14 @@ impl SessionManager {
             known_agents,
             default_timezone,
         ));
-        let session_pool = SessionPool::new(
-            session_ttl_hours,
-            agent_prompt_reinject_every,
+        let session_factory = SessionFactory::new(
             provider_config.clone(),
             tools.clone(),
             skills.clone(),
             store.clone(),
+            agent_prompt_reinject_every,
         );
+        let session_pool = SessionPool::new(session_ttl_hours, session_factory);
         let cli_sessions = CliSessionService::new(store.clone());
 
         Ok(Self {

src/gateway/session_factory.rs

@@ -0,0 +1,56 @@
+use std::sync::Arc;
+
+use tokio::sync::mpsc;
+
+use crate::agent::AgentError;
+use crate::config::LLMProviderConfig;
+use crate::protocol::WsOutbound;
+use crate::skills::SkillRuntime;
+use crate::storage::SessionStore;
+use crate::tools::ToolRegistry;
+
+use super::session::Session;
+
+#[derive(Clone)]
+pub(crate) struct SessionFactory {
+    provider_config: LLMProviderConfig,
+    tools: Arc<ToolRegistry>,
+    skills: Arc<SkillRuntime>,
+    store: Arc<SessionStore>,
+    agent_prompt_reinject_every: u64,
+}
+
+impl SessionFactory {
+    pub(crate) fn new(
+        provider_config: LLMProviderConfig,
+        tools: Arc<ToolRegistry>,
+        skills: Arc<SkillRuntime>,
+        store: Arc<SessionStore>,
+        agent_prompt_reinject_every: u64,
+    ) -> Self {
+        Self {
+            provider_config,
+            tools,
+            skills,
+            store,
+            agent_prompt_reinject_every,
+        }
+    }
+
+    pub(crate) async fn create(
+        &self,
+        channel_name: impl Into<String>,
+        user_tx: mpsc::Sender<WsOutbound>,
+    ) -> Result<Session, AgentError> {
+        Session::new(
+            channel_name.into(),
+            self.provider_config.clone(),
+            user_tx,
+            self.tools.clone(),
+            self.skills.clone(),
+            self.store.clone(),
+            self.agent_prompt_reinject_every,
+        )
+        .await
+    }
+}

src/gateway/session_pool.rs

@@ -5,22 +5,15 @@ use std::time::{Duration, Instant};
 use tokio::sync::{Mutex, mpsc};
 
 use crate::agent::AgentError;
-use crate::config::LLMProviderConfig;
 use crate::protocol::WsOutbound;
-use crate::skills::SkillRuntime;
-use crate::storage::SessionStore;
-use crate::tools::ToolRegistry;
 
 use super::session::Session;
+use super::session_factory::SessionFactory;
 
 #[derive(Clone)]
 pub(crate) struct SessionPool {
     inner: Arc<Mutex<SessionPoolInner>>,
-    provider_config: LLMProviderConfig,
-    tools: Arc<ToolRegistry>,
-    skills: Arc<SkillRuntime>,
-    store: Arc<SessionStore>,
-    agent_prompt_reinject_every: u64,
+    session_factory: SessionFactory,
 }
 
 struct SessionPoolInner {
@@ -30,25 +23,14 @@ struct SessionPoolInner {
 }
 
 impl SessionPool {
-    pub(crate) fn new(
-        session_ttl_hours: u64,
-        agent_prompt_reinject_every: u64,
-        provider_config: LLMProviderConfig,
-        tools: Arc<ToolRegistry>,
-        skills: Arc<SkillRuntime>,
-        store: Arc<SessionStore>,
-    ) -> Self {
+    pub(crate) fn new(session_ttl_hours: u64, session_factory: SessionFactory) -> Self {
         Self {
             inner: Arc::new(Mutex::new(SessionPoolInner {
                 sessions: HashMap::new(),
                 session_timestamps: HashMap::new(),
                 session_ttl: Duration::from_secs(session_ttl_hours * 3600),
             })),
-            provider_config,
-            tools,
-            skills,
-            store,
-            agent_prompt_reinject_every,
+            session_factory,
         }
     }
 
@@ -74,15 +56,9 @@ impl SessionPool {
             inner.sessions.remove(channel_name);
 
             let (user_tx, _rx) = mpsc::channel::<WsOutbound>(100);
-            let session = Session::new(
-                channel_name.to_string(),
-                self.provider_config.clone(),
-                user_tx,
-                self.tools.clone(),
-                self.skills.clone(),
-                self.store.clone(),
-                self.agent_prompt_reinject_every,
-            )
+            let session = self
+                .session_factory
+                .create(channel_name.to_string(), user_tx)
                 .await?;
 
             inner