refactor: 清理未使用的 dead code 函数与方法

src/agent/agent_loop.rs

@@ -642,17 +642,6 @@ fn chat_message_to_llm_message(m: &ChatMessage, image_budget: &mut ImageInlineBu
     }
 }
 
-fn chat_message_to_text_only_llm_message(m: &ChatMessage) -> Message {
-    Message {
-        role: m.role.clone(),
-        content: vec![ContentBlock::text(&m.content)],
-        reasoning_content: m.reasoning_content.clone(),
-        tool_call_id: m.tool_call_id.clone(),
-        name: m.tool_name.clone(),
-        tool_calls: m.tool_calls.clone(),
-    }
-}
-
 /// AgentLoop - Stateless agent that processes messages with tool calling support.
 /// History is managed externally by SessionManager.
 pub struct AgentLoop {

src/gateway/session.rs

@@ -512,7 +512,8 @@ impl Session {
             .unwrap_or(false)
     }
 
-    pub(crate) fn matches_current_user_turn(&self, topic_id: &str, message: &ChatMessage) -> bool {
+    #[cfg(test)]
+    fn matches_current_user_turn(&self, topic_id: &str, message: &ChatMessage) -> bool {
         self.history.matches_current_user_turn(topic_id, message)
     }
 

src/gateway/session_history.rs

@@ -220,6 +220,7 @@ impl SessionHistory {
             .and_then(|history| history.iter().rev().find(|message| message.role == "user"))
     }
 
+    #[cfg(test)]
     pub(crate) fn matches_current_user_turn(&self, topic_id: &str, message: &ChatMessage) -> bool {
         self.latest_user_message(topic_id)
             .map(|current| {