feat(web): include removed in visible stats; cover bang badge

站内展示/统计统一 VISIBLE（含 removed）：热度、UP 列表、总览
active_ups/初导入计数、说明页粉丝覆盖、黑名单视频数。采集队列仍
只 active/unfaved。失效片封面右上角感叹号徽标，点击/tap 提示
「该视频已失效」；手动/候选入库仍可复活 removed→active。

tests/test_removed_cover_mark.py

@@ -0,0 +1,34 @@
+# -*- coding: utf-8 -*-
+"""失效封面徽标静态落地检查: uv run python tests/test_removed_cover_mark.py"""
+
+from pathlib import Path
+
+ROOT = Path(__file__).resolve().parents[1]
+STATIC = ROOT / "reaction_board" / "web" / "static"
+
+
+def test_removed_cover_mark_markup():
+    components = (STATIC / "components.js").read_text(encoding="utf-8")
+    assert "export function removedCoverMark" in components
+    assert 'data-removed-tip' in components
+    assert "该视频已失效" in components
+    assert "${removedCoverMark(item)}" in components
+
+    app = (STATIC / "app.js").read_text(encoding="utf-8")
+    assert 'closest("[data-removed-tip]")' in app
+    assert 'toast("该视频已失效")' in app
+
+    css = (STATIC / "style.css").read_text(encoding="utf-8")
+    assert ".cover-removed-mark" in css
+
+    video = (STATIC / "views" / "video.js").read_text(encoding="utf-8")
+    assert "removedCoverMark(detail)" in video
+
+
+def main():
+    test_removed_cover_mark_markup()
+    print("OK: 失效封面徽标静态落地检查通过")
+
+
+if __name__ == "__main__":
+    main()