feat(sensor): 返回候选节点最大管径

app/services/sensor_placement.py

@@ -80,6 +80,11 @@ def _sensor_points(
         points.append(
             {
                 "node_id": node_id,
+                "max_pipe_diameter": (
+                    float(node["max_pipe_diameter"])
+                    if node["max_pipe_diameter"] is not None
+                    else None
+                ),
                 "project_x": project_x,
                 "project_y": project_y,
                 "map_x": map_x,
@@ -92,6 +97,15 @@ def _sensor_points(
     return points
 
 
+def get_sensor_placement_candidate(
+    network: str,
+    node_id: str,
+) -> dict[str, Any]:
+    """Return the authoritative editable point data for one junction."""
+
+    return _sensor_points(network, _normalize_locations([node_id]))[0]
+
+
 def validate_sensor_placement_nodes(
     network: str,
     sensor_location: list[str],