Add Java wrapper test for HoughPoint2Line in ximgproc module

- Add basic functionality test for HoughPoint2Line in XimgprocTest.java
- Add gen_dict.json to expose RO_STRICT and RO_IGNORE_BORDERS constants in Java wrapper
- Implement minimal test to verify method call and output validity

Author: utibenkei

modules/ximgproc/misc/java/gen_dict.json

@@ -0,0 +1,10 @@
+{
+    "missing_consts": {
+        "Ximgproc": {
+            "public": [
+                ["RO_STRICT", 0],
+                ["RO_IGNORE_BORDERS", 1]
+            ]
+        }
+    }
+}

modules/ximgproc/misc/java/test/XimgprocTest.java

@@ -0,0 +1,21 @@
+package org.opencv.test.ximgproc;
+
+import org.opencv.core.Core;
+import org.opencv.core.CvType;
+import org.opencv.core.Mat;
+import org.opencv.core.Point;
+import org.opencv.test.OpenCVTestCase;
+import org.opencv.ximgproc.Ximgproc;
+
+public class XimgprocTest extends OpenCVTestCase {
+
+    public void testHoughPoint2Line() {
+        Mat src = new Mat(80, 80, CvType.CV_8UC1, new org.opencv.core.Scalar(0));
+        Point houghPoint = new Point(40, 40);
+
+        int[] result = Ximgproc.HoughPoint2Line(houghPoint, src, Ximgproc.ARO_315_135, Ximgproc.HDO_DESKEW, Ximgproc.RO_IGNORE_BORDERS);
+
+        assertNotNull(result);
+        assertEquals(4, result.length);
+    }
+}