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_bilibili_client.py

@@ -25,8 +25,13 @@ from fixtures import (  # noqa: E402
     FOLDERS_PAYLOAD,
     IDS_PAYLOAD,
     INVALID_INFO,
+    NAV_PAYLOAD,
+    RELATION_PAYLOAD,
     VALID_INFO,
+    VIEW_PAYLOAD,
+    VIEW_UNAVAILABLE,
     info_for,
+    view_for,
 )
 
 
@@ -274,6 +279,88 @@ def test_timeout_and_method_forwarded():
     assert call["timeout"] == 30
 
 
+def test_view_seven_metrics():
+    transport = QueueTransport([http_json(VIEW_PAYLOAD)])
+    client, _ = make_client(transport)
+    stat = client.view(117530286889638)
+    assert stat.aid == 117530286889638
+    assert stat.bvid == "BV1xvxi6LEZD"
+    assert stat.metrics() == {
+        "view": 819, "like": 44, "favorite": 43, "coin": 9,
+        "share": 1, "reply": 16, "danmaku": 7,
+    }
+    assert "aid=117530286889638" in transport.calls[0]["url"]
+
+
+def test_view_unavailable_and_malformed():
+    transport = QueueTransport([
+        http_json(VIEW_UNAVAILABLE), http_json(VIEW_UNAVAILABLE),
+    ])
+    client, _ = make_client(transport)
+    try:
+        client.view(1)
+    except BilibiliAPIError as exc:
+        assert exc.code == 62012
+    else:
+        raise AssertionError("不可访问视频应抛业务错误")
+
+    payload = view_for(1)
+    payload["data"]["stat"].pop("coin")
+    bad = http_json(payload)
+    transport = QueueTransport([bad, bad])
+    client, _ = make_client(transport)
+    try:
+        client.view(1)
+    except BilibiliProtocolError as exc:
+        assert "coin" in str(exc)
+    else:
+        raise AssertionError("缺少 stat 字段应报协议错误")
+
+
+def test_relation_stat():
+    transport = QueueTransport([http_json(RELATION_PAYLOAD)])
+    client, _ = make_client(transport)
+    fan = client.relation_stat(37754047)
+    assert fan.mid == 37754047
+    assert fan.follower == 2767268
+    assert fan.following == 95
+    assert "vmid=37754047" in transport.calls[0]["url"]
+
+
+def test_check_login():
+    transport = QueueTransport([http_json(NAV_PAYLOAD)])
+    client, _ = make_client(transport)
+    state = client.check_login()
+    assert state.is_login is True
+    assert state.mid == 28802351
+    assert state.uname == "冷萃编译器"
+    assert "SESSDATA=secret" in transport.calls[0]["headers"]["cookie"]
+
+    transport = QueueTransport([http_json({
+        "code": 0, "message": "0", "ttl": 1,
+        "data": {"isLogin": False, "mid": 0, "uname": ""},
+    })])
+    client, _ = make_client(transport)
+    state = client.check_login()
+    assert state.is_login is False and state.mid == 0
+
+    transport = QueueTransport([http_json({"code": -101, "message": "账号未登录", "data": None})])
+    client, _ = make_client(transport)
+    state = client.check_login()
+    assert state.is_login is False
+    assert state.code == -101
+    assert "账号未登录" in state.message
+
+
+def test_check_login_without_cookie_makes_no_request():
+    transport = QueueTransport([])
+    client, _ = make_client(transport, cookie="")
+    state = client.check_login()
+    assert state.is_login is False
+    assert state.message == "未配置 cookie"
+    assert transport.calls == []
+
+
 def main():
     test_fav_ids_parse_and_anonymous_header()
     test_anonymous_failure_falls_back_to_full_cookie()
@@ -288,6 +375,11 @@ def main():
     test_fav_infos_chunk_size_validation()
     test_pacer_delays_after_first_request()
     test_timeout_and_method_forwarded()
+    test_view_seven_metrics()
+    test_view_unavailable_and_malformed()
+    test_relation_stat()
+    test_check_login()
+    test_check_login_without_cookie_makes_no_request()
     print("OK: B 站只读客户端契约与重试测试全部通过")