feat(expression): 添加表达方式选择模式支持与DatabaseMessages兼容性改进

- 新增统一的表达方式选择入口，支持classic和exp_model两种模式
- 添加StyleLearner模型预测模式，可基于机器学习模型选择表达风格
- 改进多个模块对DatabaseMessages数据模型的兼容性处理
- 优化消息处理逻辑，统一处理字典和DatabaseMessages对象
- 在配置中添加expression.mode字段控制表达选择模式

src/chat/replyer/default_generator.py

@@ -27,6 +27,7 @@ from src.chat.utils.prompt import Prompt, global_prompt_manager
 from src.chat.utils.prompt_params import PromptParameters
 from src.chat.utils.timer_calculator import Timer
 from src.chat.utils.utils import get_chat_type_and_target_info
+from src.common.data_models.database_data_model import DatabaseMessages
 from src.common.logger import get_logger
 from src.config.config import global_config, model_config
 from src.individuality.individuality import get_individuality
@@ -474,10 +475,13 @@ class DefaultReplyer:
         style_habits = []
         grammar_habits = []
 
-        # 使用从处理器传来的选中表达方式
-        # LLM模式：调用LLM选择5-10个，然后随机选5个
-        selected_expressions = await expression_selector.select_suitable_expressions_llm(
-            self.chat_stream.stream_id, chat_history, max_num=8, min_num=2, target_message=target
+        # 使用统一的表达方式选择入口（支持classic和exp_model模式）
+        selected_expressions = await expression_selector.select_suitable_expressions(
+            chat_id=self.chat_stream.stream_id,
+            chat_history=chat_history,
+            target_message=target,
+            max_num=8,
+            min_num=2
         )
 
         if selected_expressions:
@@ -1206,7 +1210,7 @@ class DefaultReplyer:
         extra_info: str = "",
         available_actions: dict[str, ActionInfo] | None = None,
         enable_tool: bool = True,
-        reply_message: dict[str, Any] | None = None,
+        reply_message: dict[str, Any] | DatabaseMessages | None = None,
     ) -> str:
         """
         构建回复器上下文
@@ -1248,10 +1252,24 @@ class DefaultReplyer:
             if reply_message is None:
                 logger.warning("reply_message 为 None，无法构建prompt")
                 return ""
-            platform = reply_message.get("chat_info_platform")
+            
+            # 统一处理 DatabaseMessages 对象和字典
+            if isinstance(reply_message, DatabaseMessages):
+                platform = reply_message.chat_info.platform
+                user_id = reply_message.user_info.user_id
+                user_nickname = reply_message.user_info.user_nickname
+                user_cardname = reply_message.user_info.user_cardname
+                processed_plain_text = reply_message.processed_plain_text
+            else:
+                platform = reply_message.get("chat_info_platform")
+                user_id = reply_message.get("user_id")
+                user_nickname = reply_message.get("user_nickname")
+                user_cardname = reply_message.get("user_cardname")
+                processed_plain_text = reply_message.get("processed_plain_text")
+            
             person_id = person_info_manager.get_person_id(
                 platform,  # type: ignore
-                reply_message.get("user_id"),  # type: ignore
+                user_id,  # type: ignore
             )
             person_name = await person_info_manager.get_value(person_id, "person_name")
 
@@ -1260,22 +1278,22 @@ class DefaultReplyer:
                 # 尝试从reply_message获取用户名
                 await person_info_manager.first_knowing_some_one(
                     platform,  # type: ignore
-                    reply_message.get("user_id"),  # type: ignore
-                    reply_message.get("user_nickname") or "",
-                    reply_message.get("user_cardname") or "",
+                    user_id,  # type: ignore
+                    user_nickname or "",
+                    user_cardname or "",
                 )
 
             # 检查是否是bot自己的名字，如果是则替换为"(你)"
             bot_user_id = str(global_config.bot.qq_account)
             current_user_id = await person_info_manager.get_value(person_id, "user_id")
-            current_platform = reply_message.get("chat_info_platform")
+            current_platform = platform
 
             if current_user_id == bot_user_id and current_platform == global_config.bot.platform:
                 sender = f"{person_name}(你)"
             else:
                 # 如果不是bot自己，直接使用person_name
                 sender = person_name
-            target = reply_message.get("processed_plain_text")
+            target = processed_plain_text
 
         # 最终的空值检查，确保sender和target不为None
         if sender is None:
@@ -1609,15 +1627,22 @@ class DefaultReplyer:
         raw_reply: str,
         reason: str,
         reply_to: str,
-        reply_message: dict[str, Any] | None = None,
+        reply_message: dict[str, Any] | DatabaseMessages | None = None,
     ) -> str:  # sourcery skip: merge-else-if-into-elif, remove-redundant-if
         chat_stream = self.chat_stream
         chat_id = chat_stream.stream_id
         is_group_chat = bool(chat_stream.group_info)
 
         if reply_message:
-            sender = reply_message.get("sender")
-            target = reply_message.get("target")
+            if isinstance(reply_message, DatabaseMessages):
+                # 从 DatabaseMessages 对象获取 sender 和 target
+                # 注意: DatabaseMessages 没有直接的 sender/target 字段
+                # 需要根据实际情况构造
+                sender = reply_message.user_info.user_nickname or reply_message.user_info.user_id
+                target = reply_message.processed_plain_text or ""
+            else:
+                sender = reply_message.get("sender")
+                target = reply_message.get("target")
         else:
             sender, target = self._parse_reply_target(reply_to)