feat(p1): add daily snapshots and fan tracking

Implement P1: seven-metric view snapshots, relation/stat fan snapshots, failure placeholders, resume by daily completion markers, Cookie login warnings, daily SQLite backups, Shanghai daily scheduling, and CLI snapshot/auth-check commands. Real read-only run captured 795/795 videos successfully over 1124s with a verified daily backup.

tests/test_timeutil.py

@@ -0,0 +1,84 @@
+# -*- coding: utf-8 -*-
+"""上海时区与每日时间计算测试: uv run python tests/test_timeutil.py"""
+
+import os
+import sys
+from datetime import datetime
+
+sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
+sys.stdout.reconfigure(encoding="utf-8")
+
+from reaction_board.timeutil import (  # noqa: E402
+    SHANGHAI_TZ,
+    day_bounds,
+    is_date,
+    next_daily_run,
+    parse_hhmm,
+    shanghai_date,
+    shanghai_datetime,
+)
+
+
+def ts(text):
+    return datetime.strptime(text, "%Y-%m-%d %H:%M:%S").replace(tzinfo=SHANGHAI_TZ).timestamp()
+
+
+def test_shanghai_date_boundary():
+    # UTC 2026-10-31 15:59:59 = 上海 2026-10-31 23:59:59
+    assert shanghai_date(ts("2026-10-31 23:59:59")) == "2026-10-31"
+    # UTC 2026-10-31 16:00:00 = 上海 2026-11-01 00:00:00
+    assert shanghai_date(ts("2026-11-01 00:00:00")) == "2026-11-01"
+    assert shanghai_datetime().tzinfo is not None
+
+
+def test_parse_hhmm():
+    assert parse_hhmm("00:01") == (0, 1)
+    assert parse_hhmm("23:59") == (23, 59)
+    for bad in ("24:00", "1:01", "00:60", "", "abc"):
+        try:
+            parse_hhmm(bad)
+        except ValueError:
+            pass
+        else:
+            raise AssertionError(f"{bad!r} 应失败")
+
+
+def test_next_daily_run():
+    # 当天 00:01 之前 -> 当天 00:01
+    now = ts("2026-11-01 00:00:10")
+    nxt = next_daily_run(now, "00:01")
+    assert nxt == ts("2026-11-01 00:01:00")
+    # 正好 00:01:00 -> 下一天（严格大于）
+    assert next_daily_run(ts("2026-11-01 00:01:00"), "00:01") == ts("2026-11-02 00:01:00")
+    # 当天 00:01 之后 -> 次日
+    assert next_daily_run(ts("2026-11-01 23:59:59"), "00:01") == ts("2026-11-02 00:01:00")
+    # 跨月
+    assert next_daily_run(ts("2026-10-31 12:00:00"), "00:01") == ts("2026-11-01 00:01:00")
+
+
+def test_day_bounds_and_date_validation():
+    start, end = day_bounds("2026-11-01")
+    assert start == ts("2026-11-01 00:00:00")
+    assert end == ts("2026-11-02 00:00:00")
+    assert end - start == 86400
+    assert is_date("2026-11-01")
+    for bad in ("2026-13-01", "2026-02-30", "2026/11/01", "20261101", ""):
+        assert not is_date(bad), bad
+    try:
+        day_bounds("bad")
+    except ValueError:
+        pass
+    else:
+        raise AssertionError("非法日期应失败")
+
+
+def main():
+    test_shanghai_date_boundary()
+    test_parse_hhmm()
+    test_next_daily_run()
+    test_day_bounds_and_date_validation()
+    print("OK: 上海时区与每日时间计算测试全部通过")
+
+
+if __name__ == "__main__":
+    main()