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/tests/test_dashboard.py

@@ -290,3 +290,24 @@ def test_overview_avg_stay_mixed_v1_v2_session(client, member_user):
     d = client.get("/api/admin/dashboard/overview", {"range": "today"}).json()["data"]
     assert d["cards"]["visits"]["value"] == 1
     assert d["cards"]["avg_stay_ms"] == {"value": 38000, "delta_pct": None}   # 38000/1；上期无会话 → None
+
+
+def test_overview_trend_pv_only_page_view(client, member_user):
+    """PV 口径回归（阶段A T11）：SDK 0.2.0 每 15s 一条 page_stay 增量 + sdk_loaded，
+    趋势自愈回写 DailyStat.pv 只计 page_view（与 daily_counts 同口径）——
+    增量停留事件不得灌倍 PV；uv 仍按任意事件 distinct visitor 计。"""
+    _auth(client, member_user)
+    site = Site.objects.create(name="s", domains=["a.com"])
+    v1 = _visitor(site, "v1", last_seen=timezone.now())
+    s1 = _session(site, v1, "s1")
+    # 模拟一次活跃访问的事件流：1 次浏览 + SDK 装载 + 3 条 15s 停留增量
+    names = ["page_view", "sdk_loaded", "page_stay", "page_stay", "page_stay"]
+    for i, name in enumerate(names):
+        Event.objects.create(site=site, visitor=v1, session=s1,
+            event_id=f"pvx-{i}", event_name=name,
+            occurred_at=NOW + timedelta(seconds=i), path="/")
+
+    d = client.get("/api/admin/dashboard/overview").json()["data"]
+    assert d["trend"][-1] == {"date": TODAY.isoformat(), "uv": 1, "sessions": 1}
+    row = DailyStat.objects.get(site=site, date=TODAY)
+    assert (row.pv, row.uv) == (1, 1)   # 5 条事件仅 1 条 page_view 计 PV