fix(sensor-placement): stabilize engineering drawing export

Render the OpenLayers basemap at the final A3 map-box resolution with pixelRatio 1, carry provider attribution into the drawing, and keep the linework/basemap export path covered by regression tests.

src/components/olmap/MonitoringPlaceOptimization/engineeringDrawing.ts

@@ -13,6 +13,7 @@ interface DrawingOptions {
   network: string;
   networkData: NetworkDrawingData;
   mapCanvas?: HTMLCanvasElement | null;
+  mapAttribution?: string | null;
   dirty: boolean;
   width?: number;
 }
@@ -123,6 +124,7 @@ export const renderEngineeringDrawing = async ({
   network,
   networkData,
   mapCanvas,
+  mapAttribution,
   dirty,
   width = A3_LANDSCAPE_WIDTH,
 }: DrawingOptions): Promise<HTMLCanvasElement> => {
@@ -261,6 +263,20 @@ export const renderEngineeringDrawing = async ({
   context.strokeStyle = "#111827";
   context.lineWidth = px(4);
   context.strokeRect(mapBox.x, mapBox.y, mapBox.width, mapBox.height);
+  if (mapCanvas && mapAttribution) {
+    context.fillStyle = "#334155";
+    drawText(
+      context,
+      `底图来源：${mapAttribution}`,
+      mapBox.x + mapBox.width - px(16),
+      mapBox.y + mapBox.height - px(18),
+      px(18),
+      500,
+      "right",
+      "rgba(255,255,255,0.96)",
+      px(6),
+    );
+  }
 
   for (let index = 0; index <= 4; index += 1) {
     const ratio = index / 4;