auto 任务运行中实时显示已爬/待爬缓存数; 人工停止后继续爬取验证

- engine: CrawlJob 增加 _auto_visited/_auto_pending 运行中实时状态 (含发现新链接入队后刷新)
- app.py 详情接口: 任务运行中优先读内存实时值, 不再显示上次运行结束的旧数字
- 端到端验证: 人工停止(已爬3,缓存18) → 继续爬取(跳过seed,爬完18页,缓存0) ✅
- 运行中采样: visited 1→2 实时增长, pending 15→14 同步递减 ✅

engine.py

@@ -226,6 +226,9 @@ class CrawlJob:
         self.persist = persist          # callable(task_id, run)
         self._stop = threading.Event()
         self._pause = threading.Event()
+        # 运行中的 auto 实时状态 (供详情接口读取; 任务结束时由状态文件兜底)
+        self._auto_visited = None
+        self._auto_pending = None
         self._cfg_lock = threading.RLock()
         self.thread = None
 
@@ -630,6 +633,8 @@ class CrawlJob:
             queued.add(normalize_url(u))
 
         run["progress"]["total"] = len(queue)
+        self._auto_visited = len(visited)
+        self._auto_pending = len(queue)
         self._persist()
 
         p, browser, ctx, page, cookie_file = self._open_browser()
@@ -650,6 +655,8 @@ class CrawlJob:
                 if key in visited and url != seed:     # 起始网址不去重, 其余已爬跳过
                     continue
                 visited.add(key)
+                self._auto_visited = len(visited)
+                self._auto_pending = len(queue)
                 idx = len(visited)
                 run["progress"]["current_url"] = url
                 run["progress"]["done"] = len(visited)
@@ -666,6 +673,7 @@ class CrawlJob:
                         if lk not in visited and lk not in queued:
                             queued.add(lk)
                             queue.append((link, depth + 1, url))
+                    self._auto_pending = len(queue)   # 新链接入队后实时刷新
                 if entry["status"] == "OK":
                     self._delay()
             run["progress"]["total"] = len(visited)