fix(core): 修正因异步改造遗漏的 await 调用

在最近的数据库异步化重构后，部分函数的调用处忘记添加 `await` 关键字，导致协程未被正确执行。

本次提交修复了以下模块中的问题：
- `ExpressionLearner`
- `ChatMessageBuilder`
- `EmojiAction

src/chat/express/expression_learner.py

@@ -145,7 +145,7 @@ class ExpressionLearner:
         Returns:
             bool: 是否成功触发学习
         """
-        if not self.should_trigger_learning():
+        if not await self.should_trigger_learning():
             return False
 
         try:

src/chat/utils/chat_message_builder.py

@@ -1227,7 +1227,7 @@ async def build_anonymous_messages(messages: List[Dict[str, Any]]) -> str:
 
     # 在最前面添加图片映射信息
     final_output_lines = []
-    pic_mapping_info = build_pic_mapping_info(pic_id_mapping)
+    pic_mapping_info = await build_pic_mapping_info(pic_id_mapping)
     if pic_mapping_info:
         final_output_lines.append(pic_mapping_info)
         final_output_lines.append("\n\n")

src/plugins/built_in/emoji_plugin/emoji.py

@@ -77,7 +77,7 @@ class EmojiAction(BaseAction):
 
             # 3. 根据历史记录筛选表情
             try:
-                recent_emojis_desc = get_recent_emojis(self.chat_id, limit=10)
+                recent_emojis_desc = await get_recent_emojis(self.chat_id, limit=10)
                 if recent_emojis_desc:
                     filtered_emojis = [emoji for emoji in all_emojis_obj if emoji.description not in recent_emojis_desc]
                     if filtered_emojis:
@@ -122,7 +122,7 @@ class EmojiAction(BaseAction):
                     emoji_base64, emoji_description = random.choice(all_emojis_data)
                 else:
                     # 获取最近的5条消息内容用于判断
-                    recent_messages = message_api.get_recent_messages(chat_id=self.chat_id, limit=5)
+                    recent_messages = await message_api.get_recent_messages(chat_id=self.chat_id, limit=5)
                     messages_text = ""
                     if recent_messages:
                         messages_text = await message_api.build_readable_messages(
@@ -181,7 +181,7 @@ class EmojiAction(BaseAction):
             elif global_config.emoji.emoji_selection_mode == "description":
                 # --- 详细描述选择模式 ---
                 # 获取最近的5条消息内容用于判断
-                recent_messages = message_api.get_recent_messages(chat_id=self.chat_id, limit=5)
+                recent_messages = await message_api.get_recent_messages(chat_id=self.chat_id, limit=5)
                 messages_text = ""
                 if recent_messages:
                     messages_text = await message_api.build_readable_messages(
@@ -260,7 +260,7 @@ class EmojiAction(BaseAction):
 
             # 发送成功后，记录到历史
             try:
-                add_emoji_to_history(self.chat_id, emoji_description)
+                await add_emoji_to_history(self.chat_id, emoji_description)
             except Exception as e:
                 logger.error(f"{self.log_prefix} 添加表情到历史记录时出错: {e}")