打通自动回复与表情语义库联动\n\n- 新增表情语义解析与表情资产查询模块，支持从历史表情中提取可读中文语义\n- 为 ai_auto_response 增加短回复表情匹配器，命中语义时优先发送表情并支持失败回退文本\n- 调整自动回复提示词与配置项，强化短情绪回复场景的表情替换能力

db/emoji_asset_db.py

@@ -0,0 +1,45 @@
+# -*- coding: utf-8 -*-
+from typing import Dict, List, Optional
+
+from db.base import BaseDBOperator
+from db.connection import DBConnectionManager
+
+
+class EmojiAssetDB(BaseDBOperator):
+    """表情资产查询。
+
+    说明：
+    1. 这里单独抽出查询类，避免自动回复插件为了拿表情库再去依赖后台蓝图；
+    2. 查询只关心消息表里的原始表情记录，不负责语义解析和匹配打分；
+    3. 后续无论后台页面、自动回复还是其他插件，都可以复用同一份表情资产数据源。
+    """
+
+    def __init__(self, db_manager: DBConnectionManager):
+        super().__init__(db_manager)
+
+    def get_recent_emoji_assets(self, limit: int = 500) -> List[Dict]:
+        """获取近期表情消息记录。"""
+        sql = """
+        SELECT message_id, group_id, sender, timestamp, message_type, attachment_url, image_path
+        FROM messages
+        WHERE message_type IN ('47', '1048625', '1090519089')
+          AND attachment_url IS NOT NULL
+          AND attachment_url <> ''
+        ORDER BY timestamp DESC
+        LIMIT %s
+        """
+        return self.execute_query(sql, (limit,)) or []
+
+    def get_emoji_asset_by_md5(self, md5: str) -> Optional[Dict]:
+        """根据 md5 获取最近一条表情记录。"""
+        sql = """
+        SELECT message_id, group_id, sender, timestamp, message_type, attachment_url, image_path
+        FROM messages
+        WHERE message_type IN ('47', '1048625', '1090519089')
+          AND attachment_url IS NOT NULL
+          AND attachment_url <> ''
+          AND attachment_url LIKE %s
+        ORDER BY timestamp DESC
+        LIMIT 1
+        """
+        return self.execute_query(sql, (f'%md5="{md5}"%',), fetch_one=True)