修改节点、管道的标签文字颜色为黑色，提高阅读性

src/app/OlMap/MapComponent.tsx

@@ -486,7 +486,7 @@ const MapComponent: React.FC<MapComponentProps> = ({ children }) => {
           d[pipeText] ? (d[pipeText] as number).toFixed(3) : "",
         getSize: 18,
         fontWeight: "bold",
-        getColor: [51, 153, 204],
+        getColor: [0, 0, 0],
         getAngle: (d: any) => d.angle || 0,
         getPixelOffset: [0, -8],
         getTextAnchor: "middle",