fix: 微信窗口被覆盖时无法唤醒 - 保留PID快速EnumWindows + 冷却缩短到10s

问题根因：
1. UIA (auto.WindowControl) 在窗口被其他程序覆盖时搜索不稳定
2. 缓存HWND验证失败时，PID也被清空，导致每次都要从psutil全进程扫描重新找PID
3. 搜索失败后30s冷却太长

修复：
- 仅清HWND，保留PID供后续EnumWindows快速复用（毫秒级，跳过psutil扫描）
- 新增PID快速路径：验证失败后先用缓存PID直接EnumWindows，再走UIA和psutil兜底
- 冷却时间从30s缩短到10s，加快恢复轮询

monitor.py

@@ -703,8 +703,9 @@ class MessageMonitor:
         except Exception:
             pass
 
+        # 仅清 HWND，保留 PID 供后续 EnumWindows 快速复用
+        old_pid = self._cached_pid.get(platform)
         self._cached_hwnd.pop(platform, None)
-        self._cached_pid.pop(platform, None)
 
         # 非阻塞：窗口未找到冷却期内直接跳过搜索，不浪费 12s 超时
         cooldown_until = self._window_not_found_until.get(platform, 0)
@@ -712,6 +713,35 @@ class MessageMonitor:
             return None
 
         if platform == "wechat":
+            # ── 快速路径：用缓存 PID 直接 EnumWindows（毫秒级，跳过 psutil 全进程扫描）──
+            if old_pid:
+                try:
+                    pid_windows = []
+                    def _fast_enum_cb(h, results, _pid=old_pid):
+                        try:
+                            _, found_pid = win32process.GetWindowThreadProcessId(h)
+                            if found_pid == _pid:
+                                top = win32gui.GetAncestor(h, win32con.GA_ROOT)
+                                if top not in results:
+                                    results.append(top)
+                        except Exception:
+                            pass
+                        return True
+                    win32gui.EnumWindows(_fast_enum_cb, pid_windows)
+                    for top in pid_windows:
+                        if not (win32gui.IsWindow(top) and win32gui.IsWindowVisible(top)):
+                            continue
+                        rect = win32gui.GetWindowRect(top)
+                        if (rect[2] - rect[0]) > 300 and (rect[3] - rect[1]) > 200:
+                            self._cached_hwnd[platform] = top
+                            self._window_not_found_until.pop(platform, None)
+                            title = win32gui.GetWindowText(top)
+                            logger.info(f"[{platform}] 窗口已定位(PID 快速): pid={old_pid} title={title!r} top={top}")
+                            return top
+                except Exception:
+                    pass
+
+            # ── UIA 搜索 ──
             for name in ["微信", "WeChat"]:
                 try:
                     w = auto.WindowControl(Name=name)
@@ -844,8 +874,8 @@ class MessageMonitor:
                         continue
             except Exception:
                 pass
-        # 搜索完毕没找到 → 设冷却避免重复 12s 超时
-        self._window_not_found_until[platform] = time.time() + 30
+        # 搜索完毕没找到 → 设冷却避免重复 12s 超时（10s 比 30s 更快恢复轮询）
+        self._window_not_found_until[platform] = time.time() + 10
         return None
 
     def _ensure_hwnd_with_timeout(self, platform: str, timeout: float = 12.0) -> Optional[int]:
@@ -875,7 +905,7 @@ class MessageMonitor:
         t.start()
         if not done.wait(timeout=timeout):
             logger.warning(f"[{platform}] _ensure_hwnd 超时({timeout:.0f}s)，跳过本轮")
-            self._window_not_found_until[platform] = time.time() + 30
+            self._window_not_found_until[platform] = time.time() + 10
             return None
         return result[0]
 
@@ -4129,6 +4159,35 @@ class MessageMonitor:
         logger.debug(f"[ocr] 过滤器2结果: 未检测到噪声特征，返回False")
         return False
 
+    # ⭐ OCR噪声前缀清理：去除UI按钮标签等OCR误识别的前缀
+    # 如"必选，运营方有哪些权利和义务?" → "运营方有哪些权利和义务?"
+    _OCR_NOISE_PREFIXES = re.compile(
+        r'^(?:必选|必填|可选|请输入|搜索|查找|查询|发送|取消|确认|确定|提交|保存|删除|编辑| '
+        r'|添加|新建|创建|设置|修改|返回|关闭|展开|收起|更多|选项|操作|'
+        r'选择|查看|下载|上传|导入|导出|刷新|重置|清空|复制|粘贴|剪切|'
+        r'同意|拒绝|同意并|下一步|上一步|完成|跳过|继续|登录|注册|退出|'
+        r'开启|关闭|启用|禁用|暂停|恢复|开始|停止|运行|'
+        r'是|否|有|无|对|错|真|假|好|坏|新|旧|已|未)'
+        r'[，,：:\s]*'
+    )
+
+    @staticmethod
+    def _clean_ocr_prefix(text: str) -> str:
+        """清理OCR噪声前缀（UI按钮标签等）。
+
+        如"必选，运营方有哪些权利和义务?" → "运营方有哪些权利和义务?"
+        只清理开头的短前缀（≤6字），避免误删正常消息内容。
+        """
+        if not text or len(text) < 4:
+            return text
+        m = MessageMonitor._OCR_NOISE_PREFIXES.match(text)
+        if m and len(m.group(0)) <= 6:
+            cleaned = text[len(m.group(0)):].strip()
+            if cleaned and len(cleaned) >= 2:
+                logger.debug(f"[ocr] 清理噪声前缀: {text[:30]!r} → {cleaned[:30]!r}")
+                return cleaned
+        return text
+
     def _paste_and_send_safe(self, text: str, hwnd: int, msg_hash: int, platform: str) -> bool:
         """Electron 应用安全发送（TIM/微信）。无 AttachThreadInput、无 SendMessage 同步点击。
 
@@ -5211,14 +5270,16 @@ class MessageMonitor:
                 self._last_new_msg_time[platform] = time.time()
             else:
                 self._last_new_msg_time[platform] = time.time()
-                self._last_msg[platform] = item
+                self._last_msg[platform] = cleaned_item
                 engine_tag = self._last_chosen_engine.get(platform, "")
                 logger.info(f"[{platform}] 新消息[{engine_tag}]: {item[:60]}")
+                # ⭐ 清理OCR噪声前缀（如"必选，"）后再搜索知识库
+                cleaned_item = self._clean_ocr_prefix(item)
                 # ⚠️ 急停检查：回复前最后检查，防止急停后仍然发送
                 if not self._running:
                     return
                 if self._on_message:
-                    self._on_message(platform, item)
+                    self._on_message(platform, cleaned_item)
                 if platform == "qq":
                     if stale == 3:
                         logger.debug(f"[QQ] 冻结 #{stale}，强制刷新")