fix(server): PV统计加event_name过滤——增量停留事件不再灌倍PV（gzip 4817B记录：0.1.0为3838，增量989）

Co-Authored-By: Claude Code <noreply@anthropic.com>

server/tracker/api/dashboard.py

@@ -12,7 +12,7 @@
 """
 from datetime import datetime, time, timedelta
 
-from django.db.models import Count, Sum
+from django.db.models import Count, Q, Sum
 from django.db.models.functions import Trunc
 from django.utils import timezone
 from rest_framework.response import Response
@@ -128,9 +128,11 @@ class OverviewView(EnvelopeMixin, APIView):
             return rows.setdefault(
                 (sid, day), {"pv": 0, "uv": 0, "sessions": 0, "new_visitors": 0})
 
+        # pv 只计 page_view（与 daily_counts 同口径）：page_stay 增量/sdk_loaded 不并计
         for r in (ev.annotate(day=Trunc("occurred_at", "day", tzinfo=tz))
                    .values("site", "day")
-                   .annotate(pv=Count("id"), uv=Count("visitor", distinct=True))):
+                   .annotate(pv=Count("id", filter=Q(event_name="page_view")),
+                             uv=Count("visitor", distinct=True))):
             row = _row(r["site"], r["day"].date())
             row["pv"], row["uv"] = r["pv"], r["uv"]
         for r in (vs.annotate(day=Trunc("started_at", "day", tzinfo=tz))