feat: 来源组合显示——徽章/识别卡拼装落地页·国家·语言（搜索意图线索）

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

server/tracker/tests/test_visitors.py

@@ -57,8 +57,8 @@ def test_list_fields_and_default_bot_excluded(client, member_user):
     site = Site.objects.create(name="s", domains=["a.com"])
     v1 = _visitor(site, "v1", country="中国", province="上海", city="上海",
                   device_type="desktop", os="Windows", browser="Chrome", language="zh-CN",
-                  first_referrer_domain="google.com", visit_count=2, active_days=1,
-                  last_seen=timezone.now())
+                  first_referrer_domain="google.com", first_landing_path="/from-google",
+                  visit_count=2, active_days=1, last_seen=timezone.now())
     v2 = _visitor(site, "v2", first_utm={"utm_source": "baidu"},
                   last_seen=timezone.now() - timedelta(hours=1))
     bot = _visitor(site, "bot-v")
@@ -77,16 +77,18 @@ def test_list_fields_and_default_bot_excluded(client, member_user):
     assert set(row) == {"visitor_id", "site_id", "site_name", "country", "province", "city",
                         "device_type", "os", "browser", "language", "first_seen_at",
                         "last_seen_at", "visit_count", "active_days", "session_count",
-                        "total_stay_ms", "first_source", "last_source", "online",
-                        "channel", "platform", "variant", "search_term", "resolution"}
+                        "total_stay_ms", "first_source", "last_source", "first_landing_path",
+                        "online", "channel", "platform", "variant", "search_term", "resolution"}
     assert row["country"] == "中国" and row["os"] == "Windows" and row["browser"] == "Chrome"
     assert row["session_count"] == 2
     assert row["total_stay_ms"] == 150000            # 120000+30000，有效停留口径
     assert row["first_source"] == "google.com"
     assert row["last_source"] == "bing.com"          # 最近会话 s2 的 referrer
+    assert row["first_landing_path"] == "/from-google"
     assert row["online"] is True
     row2 = d["list"][1]
     assert row2["first_source"] == "baidu"           # first_referrer 空 → first_utm 兜底
+    assert row2["first_landing_path"] == ""          # 未采集 → 空串（前端显示 —）
     assert row2["last_source"] == "直接访问"          # 会话无来源 → 兜底
     assert row2["total_stay_ms"] == 5000 and row2["online"] is False