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/analytics.py

@@ -34,7 +34,7 @@ DEFAULT_HEAT_WEIGHTS: dict[str, float] = {
 }
 
 MIN_VIEW_FOR_INTERACTION = 100
-MIN_VIEW_FOR_GROWTH_RATE = 200
+MIN_VIEW_FOR_GROWTH_RATE = 1000
 MIN_EFFICIENCY_DURATION = 600
 DEFAULT_MATURITY_DAYS = 2
 DEFAULT_SHRINK_MINUTES = 120.0