fix(growth): require a 1000-view baseline on the rate board

Keep small-base videos on the delta board only, and raise the smoothing prior to 1000 so videos that just clear the floor do not dominate the ranking.

reaction_board/web/queries.py

@@ -59,6 +59,19 @@ def _chunks(values: Sequence[int], size: int = 400) -> Iterable[Sequence[int]]:
         yield values[index:index + size]
 
 
+def _growth_baseline_view(item: Mapping[str, Any]) -> int | None:
+    """增速分母：当前播放减去区间增量。zero 基线的增量等于当前播放，结果为 0。"""
+    growth = item.get("growth") or {}
+    current = (item.get("metrics") or {}).get("view")
+    delta = growth.get("delta")
+    if current is None or delta is None:
+        return None
+    try:
+        return int(current) - int(delta)
+    except (TypeError, ValueError):
+        return None
+
+
 def _date_minus(day: str, days: int) -> str:
     return (date.fromisoformat(day) - timedelta(days=int(days))).isoformat()
 
@@ -1036,7 +1049,7 @@ class DashboardQueries:
                         item for item in items
                         if item.get("growth", {}).get("baseline") != "zero"
                         and item.get("growth", {}).get("rate") is not None
-                        and (item["metrics"] or {}).get("view", 0) >= MIN_VIEW_FOR_GROWTH_RATE
+                        and (_growth_baseline_view(item) or 0) >= MIN_VIEW_FOR_GROWTH_RATE
                     ]
 
             rate_prior = max(0, int(analytics.growth_rate_prior))
@@ -1087,8 +1100,8 @@ class DashboardQueries:
                 available = False
                 if growth_days == 1 and sort == "growth_rate":
                     reason = (
-                        "近 1 日增速需要前一日快照，或更早发布的新入库当天至少两次成功采样；"
-                        "当日发布不计入增速"
+                        "近 1 日增速需要基线播放至少 "
+                        f"{MIN_VIEW_FOR_GROWTH_RATE}；当日发布不计入增速"
                     )
                 elif growth_days == 1:
                     reason = (