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

reaction_board/services/snapshot.py

@@ -4,7 +4,8 @@
 规则（DEVELOPMENT.md §7.4）：
 
 * 对 ``active`` / ``unfaved`` 视频逐条请求 ``view``；
-* 成功写入七项指标；``ok=1`` 的同日快照直接跳过（断点续跑）；
+* 成功写入七项指标；``ok=1`` 的同日快照直接跳过（断点续跑；含小时任务 1 小时内刚刷新的）；
+* ``run_recent_videos`` 只刷新近 N 天新片的当日行，不改完成日 / 备份；
 * 视频不可访问时标记 ``removed``；
 * 其他错误最多重试 3 次，仍失败写 ``ok=0`` 占位，不写假零值；
 * 对 ``track_fans`` 逐个请求 ``relation/stat``（独立任务，不影响视频完成日）；
@@ -198,6 +199,8 @@ class SnapshotService:
         for index, aid in enumerate(videos, 1):
             existing = self.repo.get_snapshot(stat_date, aid)
             if existing is not None and int(existing.get("ok") or 0) == 1 and not force:
+                # 断点续跑：同日已成功则跳过。小时任务刷新过的行也是 ok=1，
+                # 自然覆盖「1 小时内 captured_at 已更新则不再次更新」的要求。
                 summary.skipped += 1
                 continue
 
@@ -269,6 +272,98 @@ class SnapshotService:
         )
         return summary
 
+    def run_recent_videos(
+        self,
+        *,
+        date: str | None = None,
+        recent_days: int | None = None,
+    ) -> SnapshotSummary:
+        """刷新近 N 天新视频的当日快照；不碰完成日标记与日备份。
+
+        「近 N 天」按 pubdate 墙钟窗口：``now - recent_video_days * 86400``，
+        不是上海日历日差。允许覆盖同日已有 ``ok=1`` 行以便小时级刷新。
+        """
+        cfg = self.config_store.get()
+        client = self._client()
+        now = self._now()
+        stat_date = date or shanghai_date(now)
+        if not is_date(stat_date):
+            raise ValueError(f"日期格式必须是 YYYY-MM-DD: {stat_date!r}")
+        days = (
+            int(cfg.schedule.recent_video_days)
+            if recent_days is None else int(recent_days)
+        )
+        if days < 1:
+            raise ValueError("recent_days 必须 >= 1")
+        # 墙钟窗口，而非按上海日历截断到日界。
+        since_pubdate = now - days * 86400
+
+        summary = SnapshotSummary(stat_date=stat_date, started_at=now)
+        self._log(
+            "info", "snapshot.recent_start",
+            stat_date=stat_date, recent_days=days, since_pubdate=since_pubdate,
+        )
+        videos = self.repo.video_aids_recent_for_snapshot(since_pubdate=since_pubdate)
+        summary.total = len(videos)
+        for index, aid in enumerate(videos, 1):
+            stat, error, unavailable = self._fetch_view(client, aid)
+            if unavailable:
+                summary.removed += 1
+                self.repo.set_video_status(aid, "removed", now=now)
+                self._log(
+                    "warning", "snapshot.recent_removed",
+                    stat_date=stat_date, aid=aid, error=error,
+                )
+            elif stat is not None:
+                self.repo.upsert_snapshot(
+                    stat_date,
+                    aid,
+                    metrics=stat.metrics(),
+                    ok=True,
+                    err=None,
+                    captured_at=self._now(),
+                )
+                if getattr(stat, "up_face", None):
+                    self.repo.apply_video_up_face(aid, stat.up_face)
+                summary.success += 1
+            else:
+                summary.failed += 1
+                self.repo.upsert_snapshot(
+                    stat_date,
+                    aid,
+                    metrics=None,
+                    ok=False,
+                    err=error,
+                    captured_at=self._now(),
+                )
+                summary.errors.append(f"aid {aid}: {error}")
+                self._log(
+                    "error", "snapshot.recent_failed",
+                    stat_date=stat_date, aid=aid, error=error,
+                )
+
+            if self.progress_every > 0 and (
+                index % self.progress_every == 0 or index == summary.total
+            ):
+                self._log(
+                    "info", "snapshot.recent_progress",
+                    stat_date=stat_date, done=index, total=summary.total,
+                    success=summary.success, failed=summary.failed,
+                    removed=summary.removed,
+                )
+
+        # 刻意不写 snapshot:completed / last_completed / 日备份：完成日只归全量任务。
+        summary.completed = summary.failed == 0
+        if summary.success or summary.removed or summary.failed:
+            self.repo.bump_cache_version("videos")
+        summary.finished_at = self._now()
+        self._log(
+            "info" if summary.completed else "warning",
+            "snapshot.recent_done",
+            **summary.as_dict(),
+        )
+        return summary
+
     def run_fans_if_needed(
         self, *, date: str | None = None, force: bool = False
     ) -> SnapshotSummary: