feat: 添加带话题的消息追加功能，支持在会话中关联当前话题 ID

src/gateway/session_history.rs

@@ -187,8 +187,10 @@ impl SessionHistory {
         message: ChatMessage,
     ) -> Result<(), AgentError> {
         let session_id = self.persistent_session_id(chat_id);
+        // 获取当前话题 ID，用于关联消息
+        let topic_id = self.chat_topic_ids.get(chat_id).map(|s| s.as_str());
         self.conversations
-            .append_message(&session_id, &message)
+            .append_message_with_topic(&session_id, topic_id, &message)
             .map_err(|err| {
                 AgentError::Other(format!("append message persistence error: {}", err))
             })?;

src/storage/ports.rs

@@ -15,6 +15,13 @@ pub trait ConversationRepository: Send + Sync + 'static {
 
     fn append_message(&self, session_id: &str, message: &ChatMessage) -> Result<(), StorageError>;
 
+    fn append_message_with_topic(
+        &self,
+        session_id: &str,
+        topic_id: Option<&str>,
+        message: &ChatMessage,
+    ) -> Result<(), StorageError>;
+
     fn clear_messages(&self, session_id: &str) -> Result<(), StorageError>;
 
     fn reset_session(&self, session_id: &str) -> Result<(), StorageError>;
@@ -140,6 +147,15 @@ impl ConversationRepository for super::SessionStore {
         super::SessionStore::append_message(self, session_id, message)
     }
 
+    fn append_message_with_topic(
+        &self,
+        session_id: &str,
+        topic_id: Option<&str>,
+        message: &ChatMessage,
+    ) -> Result<(), StorageError> {
+        super::SessionStore::append_message_with_topic(self, session_id, topic_id, message)
+    }
+
     fn clear_messages(&self, session_id: &str) -> Result<(), StorageError> {
         super::SessionStore::clear_messages(self, session_id)
     }