fix: Windows common paths try .bat before .exe (Xilinx tools are .bat)

Vitis/Vivado on Windows uses .bat wrappers, not .exe. The hardcoded
fallback paths in _find_executable step 4 only looked for .exe files.
Also expanded to try both 2023.2 and 2022.2 + Vitis/Vivado combos.

src/vitis_checker.py

@@ -201,12 +201,11 @@ def _find_executable(
 
     # 4. Common install paths (cross-platform fallback)
     if system == "windows":
-        common = [
-            f"C:/Xilinx/Vitis/2023.2/bin/{exec_name}.exe",
-            f"C:/Xilinx/Vivado/2023.2/bin/{exec_name}.exe",
-            f"C:/Xilinx/Vitis/2022.2/bin/{exec_name}.exe",
-            f"C:/Xilinx/Vivado/2022.2/bin/{exec_name}.exe",
-        ]
+        common: list[str] = []
+        for sfx in (".bat", ".exe"):
+            for ver in ("2023.2", "2022.2"):
+                for prod in ("Vitis", "Vivado"):
+                    common.append(f"C:/Xilinx/{prod}/{ver}/bin/{exec_name}{sfx}")
     else:
         common = [
             f"/data/xilinx/Vitis/2023.2/bin/{exec_name}",