fix: 设备异常状态清除（清除异常/一键清除，检查与更新原子化防竞态）

core/device_worker.py

@@ -115,6 +115,36 @@ def _remove_worker(serial):
         _WORKERS.pop(serial, None)
 
 
+def clear_worker_error(serial):
+    """清除设备错误/失败状态，恢复为 idle。运行中/连接中返回 False 不清理。
+
+    检查与更新在同一把锁内完成，避免与任务启动写 connecting/running 的竞态。
+    """
+    with _WORKERS_LOCK:
+        w = _WORKERS.get(serial)
+        if w is None:
+            return True  # 本就没有状态记录，视作已清理
+        if w.get("status") in ("running", "connecting"):
+            return False
+        w.update(status="idle", last_error="", last_warning="", task_job="",
+                 current_action="", attempt=0, progress={}, end_time=0,
+                 last_heartbeat=time.time())
+    return True
+
+
+def clear_all_worker_errors(exclude=()):
+    """批量清除所有 error/failed 状态（exclude 里的跳过）。返回清除数。"""
+    exclude = set(exclude)
+    with _WORKERS_LOCK:
+        targets = [s for s, w in _WORKERS.items()
+                   if s not in exclude and w.get("status") in ("error", "failed")]
+    cleared = 0
+    for s in targets:
+        if clear_worker_error(s):
+            cleared += 1
+    return cleared
+
+
 def get_worker_heartbeat(serial):
     """返回 worker 最近一次心跳时间，没有返回 0。"""
     with _WORKERS_LOCK: