fix(data): backfill硬化—重登on-error/登录超时/断路器/marker-resume+冷却续跑watcher

首跑5yr 673/5493后baostock连接死、定时重连没恢复、登录卡死=被限流。修四个硬伤：
- 重登on-error: except分支强制bs.logout+login建新socket再retry(原只sleep重试同死socket)
- 登录超时: SIGALRM给bs.login套30s闹钟，防永久挂起
- 断路器: 连续30只failed→save_progress+break+exit 2，不再假完成空跑2000票
- marker-resume: load_progress扫.baostock marker文件(非done JSON)，failed无marker永远重试
- watcher: 每30min探测baostock，可登就续跑，冷却就等，exit 0则退出
9/9单测绿(Mac venv311 mock baostock)。

scripts/data_platform/resume_5yr_watcher.py

@@ -0,0 +1,68 @@
+"""5yr 15min 回填冷却后自动续跑 watcher。
+
+baostock 被限流/冷却时登录会卡死或失败。本 watcher 每 30min 探测一次 baostock，
+可登就启动 backfill_15min_baostock（marker-based resume 自动续跑缺口），断路器触发
+或登录失败就继续等。backfill 成功（exit 0，全部缺口填完）则退出。
+
+ detached 启动：
+   nohup ./venv311/bin/python3 scripts/data_platform/resume_5yr_watcher.py \
+     > /Users/chufeng/data_cache/stock/logs/daily_update/resume_watcher.log 2>&1 &!
+"""
+import os
+import subprocess
+import time
+
+ROOT = "/Users/chufeng/.openclaw/sanguo_projects/sanguo_vnpy_v2"
+PY = os.path.join(ROOT, "venv311/bin/python3")
+SCRIPT = os.path.join(ROOT, "scripts/data_platform/backfill_15min_baostock.py")
+PROBE_INTERVAL = 1800  # 30min
+
+# 探测脚本：SIGALRM 给 bs.login() 套 15s 闹钟，避免卡死
+_PROBE = r'''
+import signal
+def _h(*a): raise TimeoutError()
+signal.signal(signal.SIGALRM, _h)
+signal.alarm(15)
+try:
+    import baostock as bs
+    lg = bs.login()
+    ok = lg.error_code == "0"
+    try: bs.logout()
+    except Exception: pass
+    print("LOGIN_OK" if ok else "LOGIN_FAIL")
+except Exception as e:
+    print("LOGIN_ERR", type(e).__name__, e)
+finally:
+    signal.alarm(0)
+'''
+
+
+def baostock_up() -> bool:
+    try:
+        r = subprocess.run([PY, "-c", _PROBE], capture_output=True, text=True, timeout=30)
+        return "LOGIN_OK" in r.stdout
+    except Exception:
+        return False
+
+
+def main() -> None:
+    round_ = 0
+    while True:
+        round_ += 1
+        if baostock_up():
+            print(f"[round {round_}] baostock 可登，启动回填（marker-resume 续跑缺口）", flush=True)
+            env = dict(os.environ)
+            env["STOCK_ROOT"] = "/Users/chufeng/data_cache/stock"
+            env["BS_START_DATE"] = "20210101"
+            rc = subprocess.call([PY, SCRIPT], env=env, cwd=ROOT)
+            if rc == 0:
+                print(f"[round {round_}] 回填完成（exit 0），退出 watcher", flush=True)
+                return
+            print(f"[round {round_}] 回填 exit={rc}（断路器/失败），等 {PROBE_INTERVAL}s 再试", flush=True)
+        else:
+            print(f"[round {round_}] baostock 不可登（冷却中），等 {PROBE_INTERVAL}s", flush=True)
+        time.sleep(PROBE_INTERVAL)
+
+
+if __name__ == "__main__":
+    main()