fix(growth): rank the rate board by a smoothed score

Show the real percentage on the card, but sort with delta / (baseline + prior) so a small baseline cannot dominate. Same-day publishes stay off the rate board.

project.md

@@ -679,8 +679,9 @@ w = {view:0.30, like:0.20, coin:0.20, favorite:0.15,
 ```
 d7 = (view_today - view_{today-7}) / 实际间隔天数
 r7 = (view_today - view_{today-7}) / max(view_{today-7}, 1)
-d1_published_today = view_today - 0
+d1_published_today = view_today - 0          # 只进增量榜，不计算增速
 d1_imported_today  = view_today - view_open   # 需同日第二次采样
+sort_rate = Δ / (基线 + analytics.growth_rate_prior)  # 默认 prior=500，只用于增速榜排序
 ```
 
 | 榜 | 口径 | 基数门槛 |
@@ -692,7 +693,7 @@ d1_imported_today  = view_today - view_open   # 需同日第二次采样
 | 单项榜 | 7 项直接排序 | — |
 | UP 榜 | 按 `up_mid` 聚合 Σ/AVG | — |
 
-**冷启动**：近 1 日不要求跨日快照。当日发布相对 0；更早发布且当天入库的片子相对 `view_open`（第二次采样走晚间全量，不进小时快照）。近 7/30 日仍要跨日快照。缺失日不插值。
+**冷启动**：近 1 日不要求跨日快照。当日发布相对 0，只进播放增量、不进播放增速；更早发布且当天入库的片子相对 `view_open`（第二次采样走晚间全量，不进小时快照）。近 7/30 日仍要跨日快照。缺失日不插值。
 
 ### 8.3 趋势