fix: CV 截屏声明 DPI 感知并覆盖虚拟桌面, 失败保留截屏证据

- 缩放非 100% 时未声明 DPI 感知的截屏进程只覆盖主屏左上角逻辑区域, 右侧/副屏内容丢失
- grabScreen 先 SetProcessDpiAwarenessContext(-4), 与点击脚本坐标空间一致
- 截屏范围从主屏 PrimaryScreen 改为 VirtualScreen 全部显示器
- cv_not_found 时保留截屏并在错误详情附路径, 便于排查

src/main/capabilities/cv-vision.ts

@@ -26,9 +26,12 @@ function cvTarget(args: Record<string, unknown>, nodeId: string): string {
 async function grabScreen(imagePath: string): Promise<void> {
   fs.mkdirSync(path.dirname(imagePath), { recursive: true });
   const psScript = [
+    // 与点击脚本一致: 先声明 DPI 感知, 否则缩放非 100% 时 Bounds 是逻辑像素, 截屏只覆盖屏幕左上角
+    "Add-Type -MemberDefinition '[DllImport(\"user32.dll\")] public static extern bool SetProcessDpiAwarenessContext(IntPtr value);' -Name RpaCvDpi -Namespace RpaCv | Out-Null;",
+    "try { [RpaCv.RpaCvDpi]::SetProcessDpiAwarenessContext([IntPtr](-4)) | Out-Null } catch {}",
     "Add-Type -AssemblyName System.Drawing | Out-Null;",
     "Add-Type -AssemblyName System.Windows.Forms | Out-Null;",
-    "$b = [System.Windows.Forms.Screen]::PrimaryScreen.Bounds;",
+    "$b = [System.Windows.Forms.SystemInformation]::VirtualScreen;",
     "$bmp = New-Object System.Drawing.Bitmap($b.Width, $b.Height);",
     "$g = [System.Drawing.Graphics]::FromImage($bmp);",
     "$g.CopyFromScreen($b.X, $b.Y, 0, 0, $b.Size);",
@@ -49,10 +52,15 @@ export async function locateTextOnScreen(target: string, nodeId: string): Promis
   const texts = result.texts ?? [];
   const keyword = target.trim();
   const hit = texts.find(t => t.text && t.text.includes(keyword));
-  try { fs.unlinkSync(shotPath); } catch {}
   if (!hit || !hit.box || hit.box.length < 4) {
-    throw new RuntimeError("cv_not_found", "屏幕上未找到目标文本：" + keyword, { nodeId, componentId: nodeId, recommendation: "确认目标文本在屏幕上可见且清晰" });
+    // 找不到目标时保留截屏, 便于排查(截屏范围/遮挡/清晰度)
+    throw new RuntimeError("cv_not_found", "屏幕上未找到目标文本：" + keyword, {
+      nodeId,
+      componentId: nodeId,
+      recommendation: "确认目标文本在屏幕上可见且清晰；本次截屏已保留: " + shotPath
+    });
   }
+  try { fs.unlinkSync(shotPath); } catch {}
   const xs = hit.box.map(p => p[0]);
   const ys = hit.box.map(p => p[1]);
   const cx = (Math.min(...xs) + Math.max(...xs)) / 2;