feat(桌面与监控): 完善工作台导航和登录活动定位

- 优化桌面标签、上下文标题、前进后退、导航栏隐藏和原生菜单体验

- 补充登录会话 IP 采集、地理位置回退、管理端展示及数据库迁移

- 更新桌面发布检查、运维文档和前后端测试覆盖

backend/tests/test_monitoring_server_location.py

@@ -4,6 +4,7 @@ import pytest
 
 from app.core.config import settings
 from app.services import monitoring_server_location
+from app.services.ip_geolocation_fallback import ExternalIpLocation
 
 
 def test_public_ip_normalization_rejects_private_addresses():
@@ -51,3 +52,45 @@ async def test_server_location_returns_none_instead_of_a_hardcoded_fallback(monk
 
     assert location is None
     monitoring_server_location.reset_monitoring_server_location_cache()
+
+
+@pytest.mark.asyncio
+async def test_server_location_uses_external_coordinates_when_local_coordinates_are_missing(monkeypatch):
+    monkeypatch.setattr(settings, "MONITORING_SERVER_PUBLIC_IP", "5.34.216.210")
+    monkeypatch.setattr(
+        monitoring_server_location,
+        "resolve_ip_location",
+        lambda _ip: SimpleNamespace(
+            location="公网",
+            country="",
+            province="",
+            city="",
+            isp="",
+        ),
+    )
+
+    async def fake_external_lookup(ip_addresses):
+        assert ip_addresses == ["5.34.216.210"]
+        return {
+            "5.34.216.210": ExternalIpLocation(
+                ip_address="5.34.216.210",
+                country="United States of America",
+                country_code="US",
+                region="California",
+                city="Los Angeles",
+                isp="Example ISP",
+                longitude=-118.2439,
+                latitude=34.05257,
+            )
+        }
+
+    monkeypatch.setattr(monitoring_server_location, "resolve_external_ip_locations", fake_external_lookup)
+    monitoring_server_location.reset_monitoring_server_location_cache()
+
+    location = await monitoring_server_location.resolve_monitoring_server_location()
+
+    assert location is not None
+    assert location.name == "United States of America / California / Los Angeles"
+    assert location.longitude == -118.2439
+    assert location.latitude == 34.05257
+    monitoring_server_location.reset_monitoring_server_location_cache()