修复QQ读不出/读旧数据/auto-reply错发平台

问题1: QQ读不出消息 — daemon线程SetForegroundWindow频繁失败
   -> _run_loop添加PeekMessage创建Windows消息队列
   -> _attach_set_foreground内部异常全部捕获,不抛给调用者

问题2: QQ读旧剪贴板数据 — PostMessage键盘 Electron不响应
   -> 移除前台跳过检查(降频已足够,20s一次不频繁)
   -> _click_message_area PostMessage->SendMessage(Electron响应同步消息)
   -> 移除_force_scroll_bottom(PostMessage对Electron无效)

问题3: WeChat消息错发给QQ — auto-reply daemon线程SetForegroundWindow失败
   -> auto_reply.on_kb_match不再直接调用_paste_and_send
   -> 改为get_reply_data返回{platform,answer,sender}给主线程
   -> gui.py添加_reply_queue + _flush_reply_queue(主线程after轮询)
   -> _execute_reply在主线程执行_search_contact和_paste_and_send
      (SetForegroundWindow从主线程调用永远可靠)

auto_reply.py

@@ -1,8 +1,7 @@
-"""自动回复 — 消息匹配知识库后自动发回答案"""
+"""自动回复 — 消息匹配知识库后准备答案，由主线程发送"""
 
 import logging
 import threading
-import time
 
 logger = logging.getLogger("msgbot.autoreply")
 
@@ -34,22 +33,42 @@ class AutoReply:
     def min_score(self) -> float:
         return self._min_score
 
-    def on_kb_match(self, platform: str, msg: str, top_doc: dict, score: float):
-        """知识库匹配命中时调用。线程安全。"""
+    def on_kb_match(self, platform: str, msg: str, top_doc: dict, score: float) -> str or None:
+        """知识库匹配命中时调用。线程安全。
+        返回要发送的回答文本，返回 None 表示不发送。
+        """
         if not self._enabled:
-            return
+            return None
         if score < self._min_score:
             logger.debug(
                 f"[{platform}] 匹配度 {score:.2f} < 阈值 {self._min_score}，跳过回复"
             )
-            return
+            return None
         with self._lock:
-            self._try_reply(platform, msg, top_doc, score)
+            return self._get_answer(platform, msg, top_doc, score)
 
-    def _try_reply(self, platform: str, msg: str, doc: dict, score: float):
+    def get_reply_data(self, platform: str, msg: str, top_doc: dict, score: float) -> dict or None:
+        """返回 {platform, answer, sender} 供主线程发送。"""
+        answer = self.on_kb_match(platform, msg, top_doc, score)
+        if not answer:
+            return None
+
+        # 获取发送者（在同一线程提取，不涉及窗口操作）
+        raw = self.monitor.get_raw_clipboard(platform)
+        sender = self.monitor._parse_last_sender(raw)
+        # 只有发送者是有效姓名且不在消息内容中时才切会话
+        if sender and sender not in msg and score >= self._min_score + 0.05:
+            pass
+        else:
+            sender = None
+
+        return {"platform": platform, "answer": answer, "sender": sender}
+
+    def _get_answer(self, platform: str, msg: str, doc: dict, score: float) -> str or None:
+        """提取答案 + 防重复检查。"""
         answer = doc["content"].strip()
         if not answer:
-            return
+            return None
 
         # 截取过长内容
         if len(answer) > 500:
@@ -60,7 +79,7 @@ class AutoReply:
         replied_set = self._replied.setdefault(platform, set())
         if fp in replied_set:
             logger.debug(f"[{platform}] 重复命中，跳过: {msg[:40]}")
-            return
+            return None
         replied_set.add(fp)
         # 控制缓存上限
         if len(replied_set) > 200:
@@ -70,18 +89,4 @@ class AutoReply:
             f"[{platform}] 🎯 自动回复触发 | 匹配度 {score:.2f} | "
             f"消息: {msg[:40]}"
         )
-
-        # 1. 提取发送者
-        raw = self.monitor.get_raw_clipboard(platform)
-        sender = self.monitor._parse_last_sender(raw)
-
-        if sender and sender not in msg and score >= self._min_score + 0.05:
-            # 2. 搜索联系人并切换会话
-            logger.info(f"[{platform}] 定位联系人: {sender}")
-            self.monitor._search_contact(platform, sender)
-            time.sleep(0.3)
-        else:
-            logger.info(f"[{platform}] 当前会话直接回复")
-
-        # 3. 发送消息
-        self.monitor._paste_and_send(platform, answer)
+        return answer