调整 message_util 的发送text方法名，方便替换wcf.send_text。加入了虚拟群组管理功能；

message_util.py

@@ -18,7 +18,7 @@ class MessageUtil:
         self.contact_manager = contact_manager
         self.LOG = logging.getLogger("MessageUtil")
 
-    def send_text_msg(self, msg: str, receiver: str, at_list: str = "") -> None:
+    def send_text(self, msg: str, receiver: str, at_list: str = "") -> None:
         """
         发送文本消息
         
@@ -56,11 +56,25 @@ class MessageUtil:
         """
         # 风控处理，随机延迟发送，解决群消息高频发送导致的微信风险
         time.sleep(random.uniform(0.5, 1.5))
-        
+
         self.LOG.info(f"Sending file to {receiver}: {file_path}")
         self.wcf.send_file(file_path, receiver)
 
-    def send_rich_text(self, name: str, account: str, title: str, digest: str, url: str, thumburl: str, receiver: str) -> int:
+    def send_image(self, image_path: str, receiver: str) -> None:
+        """
+        发送文件消息
+
+        :param image_path: 文件路径
+        :param receiver: 接收人wxid或者群id
+        """
+        # 风控处理，随机延迟发送，解决群消息高频发送导致的微信风险
+        time.sleep(random.uniform(0.5, 1.5))
+
+        self.LOG.info(f"Sending file to {receiver}: {image_path}")
+        self.wcf.send_image(image_path, receiver)
+
+    def send_rich_text(self, name: str, account: str, title: str, digest: str, url: str, thumburl: str,
+                       receiver: str) -> int:
         """
         发送富文本消息
         
@@ -85,7 +99,7 @@ class MessageUtil:
         """
         # 风控处理，随机延迟发送，解决群消息高频发送导致的微信风险
         time.sleep(random.uniform(0.5, 1.5))
-        
+
         self.LOG.info(f"Sending rich text to {receiver}: {title}")
         return self.wcf.send_rich_text(name, account, title, digest, url, thumburl, receiver)
 
@@ -100,4 +114,4 @@ class MessageUtil:
     # 修改使用 allContacts 的地方，改为使用 contact_manager
     # 例如：
     # 原来的代码: nickname = self.allContacts.get(wxid, wxid)
-    # 修改为: nickname = self.contact_manager.get_nickname(wxid)
+    # 修改为: nickname = self.contact_manager.get_nickname(wxid)