feat: home growth auto(7→1) and hourly recent-video snapshot

- Add analytics.home_growth_days (auto|1|7); API growth_days=auto tries 7 then 1
- Homepage shows active window and growth-board link; clearer empty reason
- New snapshot_recent scheduler task (schedule.recent_snapshot_minutes/days)
- run_recent_videos refreshes new aids only; never touches completed/backup
- Full 00:01 job keeps ok=1 skip (covers hourly refresh within 1h); mutex with recent

tests/test_web_queries.py

@@ -124,7 +124,8 @@ def test_growth_and_cold_start():
             cold = q.list_videos(sort="growth", growth_days=2)
             assert cold["available"] is False
             assert cold["items"] == []
-            assert "两天" in cold["reason"]
+            assert "至少 3 天快照" in cold["reason"]
+            assert cold["growth_days"] == 2
         finally:
             db.close()
 
@@ -361,10 +362,15 @@ def test_fans_candidates_system_and_export():
             assert system["errors"] == []
             assert system["preview"] is False
             assert system["running"] == {}
-            assert set(system["next_runs"]) >= {"fans", "snapshot", "discover"}
+            assert set(system["next_runs"]) >= {
+                "fans", "snapshot", "discover", "snapshot_recent",
+            }
             assert system["next_runs"]["snapshot"] > 0
             assert system["next_runs"]["fans"] > 0
             assert system["next_runs"]["discover"] > 0
+            assert system["next_runs"]["snapshot_recent"] > 0
+            assert system["schedule"]["recent_snapshot_minutes"] == 60
+            assert system["schedule"]["recent_video_days"] == 2
         finally:
             db.close()
 
@@ -483,6 +489,7 @@ def test_about_payload():
                 "min_view_for_ranking": 2000,
                 "video_shrink_minutes": 60,
                 "shrink_minutes": None,
+                "home_growth_days": "auto",
             }
             assert about["heat_weights"]["view"] == 0.30
             assert about["followers"]["videos_total"] == 3
@@ -553,6 +560,65 @@ def test_stats_query():
             db.close()
 
 
+
+def test_growth_auto_falls_back_to_one_day():
+    """3 天快照撑不起 7 日增长；auto 应降到 1 日。"""
+    import json
+    import os
+    import time
+
+    with tempfile.TemporaryDirectory() as tmp:
+        db, q = setup(tmp)
+        try:
+            auto = q.list_videos(sort="growth", growth_days="auto", page_size=6)
+            assert auto["available"] is True
+            assert auto["growth_days"] == 1
+            assert {item["aid"] for item in auto["items"]} == {101, 102}
+            first = next(item for item in auto["items"] if item["aid"] == 101)
+            assert first["growth"]["delta"] == 100  # 相邻日
+
+            forced7 = q.list_videos(sort="growth", growth_days=7)
+            assert forced7["available"] is False
+            assert "至少 8 天快照" in forced7["reason"]
+
+            # 配置钉死 7 天：auto 不再降级
+            path = Path(tmp) / "config.json"
+            data = json.loads(path.read_text(encoding="utf-8"))
+            data.setdefault("analytics", {})["home_growth_days"] = 7
+            path.write_text(json.dumps(data, ensure_ascii=False), encoding="utf-8")
+            target = max(path.stat().st_mtime_ns, time.time_ns()) + 1_000_000
+            os.utime(path, ns=(target, target))
+            DASHBOARD_CACHE.clear()
+            pinned = q.list_videos(sort="growth", growth_days="auto")
+            assert pinned["growth_days"] == 7
+            assert pinned["available"] is False
+        finally:
+            db.close()
+
+
+def test_snapshot_recent_next_run_follows_completion():
+    import json
+
+    with tempfile.TemporaryDirectory() as tmp:
+        db, q = setup(tmp)
+        try:
+            repo = Repository(db)
+            finished = FIXED_NOW - 10
+            repo.kv_set(
+                "task:last:snapshot_recent",
+                json.dumps({
+                    "name": "snapshot_recent", "ok": True,
+                    "started_at": finished - 5, "finished_at": finished,
+                    "error": None, "summary": {},
+                }),
+            )
+            DASHBOARD_CACHE.clear()
+            system = q.system()
+            assert system["next_runs"]["snapshot_recent"] == finished + 3600
+        finally:
+            db.close()
+
+
 def main_test():
     test_overview()
     test_video_listing_filters_and_sorting()
@@ -568,6 +634,8 @@ def main_test():
     test_fans_candidates_system_and_export()
     test_system_status_uses_completed_date_and_running_flags()
     test_system_next_runs_follow_last_completion_not_wall_clock()
+    test_growth_auto_falls_back_to_one_day()
+    test_snapshot_recent_next_run_follows_completion()
     print("OK: Web 查询层总览/榜单/详情/UP/时长效率/粉丝/候选/系统/访问统计测试全部通过")
 
 
@@ -605,7 +673,9 @@ def test_system_status_uses_completed_date_and_running_flags():
             system = q.system()
             assert "snapshot" in system["running"]
             assert system["running"]["snapshot"]["running"] is True
-            assert set(system["next_runs"]) >= {"fans", "snapshot", "discover"}
+            assert set(system["next_runs"]) >= {
+                "fans", "snapshot", "discover", "snapshot_recent",
+            }
 
             # 失败记录保留，完成日不变
             repo.kv_set(