feat(growth): same-day 1-day baselines for new videos

Let 1-day view growth use a zero baseline for videos published today, and the first successful sample for older videos ingested today, without mixing those into 7/30-day rankings.

tests/test_web_server.py

@@ -75,7 +75,7 @@ def test_readonly_routes_and_static():
             assert status == 200 and payload["ok"] is True
             status, _, payload = running.json("/api/about")
             assert status == 200
-            assert payload["data"]["schema_version"] == 7
+            assert payload["data"]["schema_version"] == 8
             assert payload["data"]["analytics"]["min_duration_seconds"] == 600
 
             status, _, overview = running.json("/api/overview")