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_config.py

@@ -139,6 +139,9 @@ def test_analytics_defaults_and_validation():
         assert cfg.analytics.min_view_for_ranking == 2000
         assert cfg.analytics.video_shrink_minutes == 60
         assert cfg.analytics.shrink_minutes is None
+        assert cfg.analytics.home_growth_days == "auto"
+        assert cfg.schedule.recent_snapshot_minutes == 60
+        assert cfg.schedule.recent_video_days == 2
 
         data = base_config()
         data["analytics"] = {
@@ -147,6 +150,14 @@ def test_analytics_defaults_and_validation():
             "min_view_for_ranking": 100,
             "video_shrink_minutes": 30,
             "shrink_minutes": 90,
+            "home_growth_days": 1,
+        }
+        data["schedule"] = {
+            "discover_minutes": 30,
+            "snapshot_at": "00:01",
+            "candidate_ttl_days": 7,
+            "recent_snapshot_minutes": 15,
+            "recent_video_days": 3,
         }
         write(path, data)
         cfg = load_config(path, env={})
@@ -155,6 +166,14 @@ def test_analytics_defaults_and_validation():
         assert cfg.analytics.min_view_for_ranking == 100
         assert cfg.analytics.video_shrink_minutes == 30
         assert cfg.analytics.shrink_minutes == 90
+        assert cfg.analytics.home_growth_days == 1
+        assert cfg.schedule.recent_snapshot_minutes == 15
+        assert cfg.schedule.recent_video_days == 3
+
+        data = base_config()
+        data["analytics"] = {"home_growth_days": 7}
+        write(path, data)
+        assert load_config(path, env={}).analytics.home_growth_days == 7
 
         for bad, hint in (
             ({"min_duration_seconds": -1}, "min_duration_seconds"),
@@ -163,6 +182,9 @@ def test_analytics_defaults_and_validation():
             ({"video_shrink_minutes": -1}, "video_shrink_minutes"),
             ({"shrink_minutes": 0}, "shrink_minutes"),
             ({"shrink_minutes": "auto"}, "shrink_minutes"),
+            ({"home_growth_days": 3}, "home_growth_days"),
+            ({"home_growth_days": "7"}, "home_growth_days"),
+            ({"home_growth_days": 0}, "home_growth_days"),
         ):
             data = base_config()
             data["analytics"] = bad
@@ -243,12 +265,38 @@ def test_web_track_defaults_and_validation():
             raise AssertionError("web.track 必须是对象")
 
 
+def test_schedule_recent_validation():
+    with tempfile.TemporaryDirectory() as tmp:
+        path = Path(tmp) / "config.json"
+        for bad, hint in (
+            ({"recent_snapshot_minutes": 0}, "recent_snapshot_minutes"),
+            ({"recent_video_days": 0}, "recent_video_days"),
+            ({"recent_snapshot_minutes": -5}, "recent_snapshot_minutes"),
+        ):
+            data = base_config()
+            data["schedule"] = {
+                "discover_minutes": 60,
+                "snapshot_at": "00:01",
+                "candidate_ttl_days": 7,
+                **bad,
+            }
+            write(path, data)
+            try:
+                load_config(path, env={})
+            except ConfigError as exc:
+                assert hint in str(exc), (bad, str(exc))
+            else:
+                raise AssertionError(f"非法 schedule 必须拒绝: {bad}")
+
+
+
 def main():
     test_dual_accounts_and_env_override()
     test_flat_and_missing_account_rejected()
     test_validation_require_read_auth_and_hot_reload()
     test_invalid_values()
     test_analytics_defaults_and_validation()
+    test_schedule_recent_validation()
     test_web_track_defaults_and_validation()
     print("OK: 双账号配置加载、拒绝 flat 格式、ENV 覆盖、热加载与 analytics/web.track 测试全部通过")