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/config.py

@@ -49,6 +49,7 @@ DEFAULT_ANALYTICS: dict[str, Any] = {
     "min_view_for_ranking": 2000,
     "video_shrink_minutes": 60,
     "shrink_minutes": None,
+    "home_growth_days": "auto",
 }
 
 DEFAULT_CONFIG: dict[str, Any] = {
@@ -84,6 +85,8 @@ DEFAULT_CONFIG: dict[str, Any] = {
         "discover_minutes": 60,
         "snapshot_at": "00:01",
         "candidate_ttl_days": 7,
+        "recent_snapshot_minutes": 60,
+        "recent_video_days": 2,
     },
     "discover": {
         "keywords": ["咻咻满"],
@@ -177,6 +180,8 @@ class ScheduleConfig:
     discover_minutes: int
     snapshot_at: str
     candidate_ttl_days: int
+    recent_snapshot_minutes: int
+    recent_video_days: int
 
 
 @dataclass(frozen=True)
@@ -200,6 +205,7 @@ class AnalyticsConfig:
     min_view_for_ranking: int
     video_shrink_minutes: int
     shrink_minutes: int | None
+    home_growth_days: str | int
 
 
 @dataclass(frozen=True)
@@ -456,6 +462,16 @@ def _build_config(data: Mapping[str, Any], path: Path) -> AppConfig:
             "schedule.candidate_ttl_days",
             minimum=1,
         ),
+        recent_snapshot_minutes=_as_int(
+            sched_raw.get("recent_snapshot_minutes", 60),
+            "schedule.recent_snapshot_minutes",
+            minimum=1,
+        ),
+        recent_video_days=_as_int(
+            sched_raw.get("recent_video_days", 2),
+            "schedule.recent_video_days",
+            minimum=1,
+        ),
     )
 
     notify_raw = data["notify"]
@@ -533,6 +549,13 @@ def _build_config(data: Mapping[str, Any], path: Path) -> AppConfig:
     if not isinstance(analytics_raw, Mapping):
         raise ConfigError("analytics 必须是对象")
     shrink_raw = analytics_raw.get("shrink_minutes")
+    home_growth_raw = analytics_raw.get("home_growth_days", "auto")
+    if home_growth_raw == "auto":
+        home_growth_days: str | int = "auto"
+    elif home_growth_raw in (1, 7):
+        home_growth_days = int(home_growth_raw)
+    else:
+        raise ConfigError('analytics.home_growth_days 必须是 "auto"、1 或 7')
     analytics = AnalyticsConfig(
         min_duration_seconds=_as_int(
             analytics_raw.get("min_duration_seconds", 600),
@@ -559,6 +582,7 @@ def _build_config(data: Mapping[str, Any], path: Path) -> AppConfig:
                 shrink_raw, "analytics.shrink_minutes", minimum=1
             )
         ),
+        home_growth_days=home_growth_days,
     )
 
     return AppConfig(