feat: 访客列表/详情/时间线/会话接口

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

server/config/urls.py

@@ -3,6 +3,8 @@ from tracker.api.collect import CollectBatchView
 from tracker.api.auth import LoginView, RefreshView, MeView, UserCreateView
 from tracker.api.sites import SiteListView, SiteDetailView
 from tracker.api.dashboard import OverviewView
+from tracker.api.visitors import (VisitorDetailView, VisitorListView,
+                                  VisitorSessionView, VisitorTimelineView)
 
 urlpatterns = [
     path("api/collect/batch", CollectBatchView.as_view()),
@@ -16,4 +18,9 @@ urlpatterns += [
     path("api/admin/sites", SiteListView.as_view()),
     path("api/admin/sites/<int:pk>", SiteDetailView.as_view()),
     path("api/admin/dashboard/overview", OverviewView.as_view()),
+    path("api/admin/visitors", VisitorListView.as_view()),
+    path("api/admin/visitors/<str:visitor_id>", VisitorDetailView.as_view()),
+    path("api/admin/visitors/<str:visitor_id>/timeline", VisitorTimelineView.as_view()),
+    path("api/admin/visitors/<str:visitor_id>/sessions/<str:session_id>",
+         VisitorSessionView.as_view()),
 ]