feat(sensor): 返回候选节点最大管径

tests/api/test_sensor_placement_endpoints.py

@@ -32,6 +32,7 @@ def _scheme(**overrides):
         "sensor_points": [
             {
                 "node_id": "J1",
+                "max_pipe_diameter": 400.0,
                 "project_x": 13500000.0,
                 "project_y": 3600000.0,
                 "map_x": 13500000.0,
@@ -42,6 +43,7 @@ def _scheme(**overrides):
             },
             {
                 "node_id": "J2",
+                "max_pipe_diameter": 300.0,
                 "project_x": 13500100.0,
                 "project_y": 3600100.0,
                 "map_x": 13500100.0,
@@ -114,6 +116,9 @@ def _load_module(monkeypatch):
             "get_sensor_placement_scheme": lambda network, scheme_id: _scheme(
                 id=scheme_id
             ),
+            "get_sensor_placement_candidate": (
+                lambda network, node_id: _scheme()["sensor_points"][0]
+            ),
             "update_sensor_placement_scheme": (
                 lambda network, scheme_id, **kwargs: _scheme(
                     id=scheme_id,
@@ -170,6 +175,18 @@ def test_optimize_returns_created_scheme(monkeypatch):
     assert captured["username"] == "alice"
 
 
+def test_get_candidate_returns_maximum_incident_pipe_diameter(monkeypatch):
+    module = _load_module(monkeypatch)
+
+    response = _client(module).get(
+        "/api/v1/sensor-placement-candidates/J1",
+    )
+
+    assert response.status_code == 200
+    assert response.json()["node_id"] == "J1"
+    assert response.json()["max_pipe_diameter"] == 400.0
+
+
 def test_optimize_rejects_unsupported_sensor_type(monkeypatch):
     module = _load_module(monkeypatch)
     response = _client(module).post(