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.

tests/test_config.py

@@ -146,7 +146,7 @@ def test_analytics_defaults_and_validation():
         assert cfg.analytics.video_shrink_minutes == 60
         assert cfg.analytics.shrink_minutes is None
         assert cfg.analytics.home_growth_days == "auto"
-        assert cfg.analytics.growth_rate_prior == 500
+        assert cfg.analytics.growth_rate_prior == 1000
         assert cfg.schedule.recent_snapshot_minutes == 60
         assert cfg.schedule.recent_video_days == 2
         assert cfg.schedule.snapshot_at == "23:15"
@@ -160,7 +160,7 @@ def test_analytics_defaults_and_validation():
             "video_shrink_minutes": 30,
             "shrink_minutes": 90,
             "home_growth_days": 1,
-            "growth_rate_prior": 1000,
+            "growth_rate_prior": 2000,
         }
         data["schedule"] = {
             "discover_minutes": 30,
@@ -178,7 +178,7 @@ def test_analytics_defaults_and_validation():
         assert cfg.analytics.video_shrink_minutes == 30
         assert cfg.analytics.shrink_minutes == 90
         assert cfg.analytics.home_growth_days == 1
-        assert cfg.analytics.growth_rate_prior == 1000
+        assert cfg.analytics.growth_rate_prior == 2000
         assert cfg.schedule.recent_snapshot_minutes == 15
         assert cfg.schedule.recent_video_days == 3