feat: v1.4 组合画布旋转编辑+方向核验+双向门符号

- 组合画布旋转编辑: 选中单元 ⟲/⟳ 90°旋转(绕几何中心)
  分割线法向与开向角度同步旋转, 水平镜像(开向镜像)
- 数据方向核验: 以31729/31740真实图纸比对确认2D渲染Y向正确
- 2D渲染补双向开启门虚线交叉符号(wtf)
- Node数学验证: 旋转后宽高互换/法向转轴/可逆性全部通过

frontend/src/components/WindoorCanvas.vue

@@ -247,7 +247,7 @@ function drawFrame(
 
   // 扇(推断: 有效bd → polyId区域(双扇对半) → 帧bbox按扇数均分)
   const regionBBs = regions.map(pts => bboxOf(pts))
-  type Glyph = { x0: number; y0: number; x1: number; y1: number; od: number; openToward?: string; isDoor?: boolean }
+  type Glyph = { x0: number; y0: number; x1: number; y1: number; od: number; openToward?: string; isDoor?: boolean; wtf?: boolean }
   const glyphs: Glyph[] = []
   const bdRect = (bd: NonNullable<SashShape['bd']>) => {
     const r = {
@@ -263,6 +263,7 @@ function drawFrame(
         od: (e.od ?? sub.od ?? 90) as number,
         openToward: (e.openToward ?? sub.openToward) as string | undefined,
         isDoor: Boolean(e.isDoor ?? sub.isDoor),
+        wtf: Boolean(e.wtf ?? sub.wtf ?? sub.withTurningFrame),
       })
     }
   }
@@ -316,22 +317,32 @@ function drawFrame(
     ctx.lineWidth = 1.3
     ctx.strokeRect(bx0 + 2, by0 + 2, w - 4, h - 4)
     ctx.setLineDash([])
-    const ang = ((g.od || 90) * Math.PI) / 180
-    const cx = (bx0 + bx1) / 2, cy = (by0 + by1) / 2
-    const L = Math.min(w, h) * 0.32
-    const ax = cx + Math.cos(ang) * L, ay = cy - Math.sin(ang) * L
-    const wx = Math.cos(ang + Math.PI / 2) * L * 0.38
-    const wy = -Math.sin(ang + Math.PI / 2) * L * 0.38
-    ctx.beginPath()
-    ctx.moveTo(ax, ay)
-    ctx.lineTo(cx - wx, cy - wy)
-    ctx.lineTo(cx + wx, cy + wy)
-    ctx.closePath()
-    ctx.fillStyle = g.openToward === 'inward' ? 'rgba(255,255,255,0.55)' : 'rgba(70,76,82,0.25)'
-    ctx.fill()
-    ctx.strokeStyle = 'rgba(70,76,82,0.95)'
-    ctx.lineWidth = 1.4
-    ctx.stroke()
+    if (g.wtf) {
+      // 双向开启门：对角虚线交叉符号（对齐原站图纸样式）
+      ctx.strokeStyle = 'rgba(70,76,82,0.7)'
+      ctx.lineWidth = 1
+      ctx.beginPath()
+      ctx.moveTo(bx0 + 4, by0 + 4); ctx.lineTo(bx1 - 4, by1 - 4)
+      ctx.moveTo(bx1 - 4, by0 + 4); ctx.lineTo(bx0 + 4, by1 - 4)
+      ctx.stroke()
+    } else {
+      const ang = ((g.od || 90) * Math.PI) / 180
+      const cx = (bx0 + bx1) / 2, cy = (by0 + by1) / 2
+      const L = Math.min(w, h) * 0.32
+      const ax = cx + Math.cos(ang) * L, ay = cy - Math.sin(ang) * L
+      const wx = Math.cos(ang + Math.PI / 2) * L * 0.38
+      const wy = -Math.sin(ang + Math.PI / 2) * L * 0.38
+      ctx.beginPath()
+      ctx.moveTo(ax, ay)
+      ctx.lineTo(cx - wx, cy - wy)
+      ctx.lineTo(cx + wx, cy + wy)
+      ctx.closePath()
+      ctx.fillStyle = g.openToward === 'inward' ? 'rgba(255,255,255,0.55)' : 'rgba(70,76,82,0.25)'
+      ctx.fill()
+      ctx.strokeStyle = 'rgba(70,76,82,0.95)'
+      ctx.lineWidth = 1.4
+      ctx.stroke()
+    }
     if (g.isDoor) {
       ctx.fillStyle = 'rgba(70,76,82,0.85)'
       ctx.font = '10px sans-serif'