🐛 fix: Step 1 JTAG check uses shared vivado path finder + build_tool_command

Root cause (2 bugs):
1. check_zynq_jtag() used config.vitis_path which no longer exists
   (config now uses xilinx_path) → always got empty path → 'Vivado not found'
2. _get_vivado_path() only checked hardcoded Linux paths, no version
   scanning, no .bat support on Windows

Fix:
- Added get_vivado_path() in vitis_checker.py (consistent with
  get_xsct_path, get_program_flash_path, etc.)
- Uses _find_executable() shared logic: scans Vivado/*/bin +
  Vitis/*/bin, picks newest version, supports .bat on Windows
- zynq_checker.py now uses get_vivado_path() + build_tool_command()
  for proper environment setup (settings64 sourcing on Linux)
- Removed obsolete _get_vivado_path() + unused shutil import

src/zynq_checker.py

@@ -10,13 +10,13 @@ from __future__ import annotations
 
 import os
 import re
-import shutil
 import subprocess
 from dataclasses import dataclass, field
 from pathlib import Path
 from typing import Callable
 
 from config_manager import Config
+from vitis_checker import get_vivado_path, build_tool_command
 
 
 @dataclass
@@ -86,9 +86,10 @@ def check_zynq_jtag(config: Config, callback: Callable | None = None) -> ZynqChe
     if callback:
         callback("start", "Connecting to hw_server...")
 
-    # Find vivado executable
-    vivado_path = _get_vivado_path(
-        config.vitis_path if hasattr(config, 'vitis_path') else ""
+    # Find vivado executable via Xilinx root scan
+    vivado_path = get_vivado_path(
+        vitis_path=getattr(config, "vitis_path", ""),
+        xilinx_root=getattr(config, "xilinx_path", ""),
     )
     if not vivado_path:
         return ZynqCheckResult(
@@ -110,8 +111,8 @@ def check_zynq_jtag(config: Config, callback: Callable | None = None) -> ZynqChe
         if callback:
             callback("progress", "Scanning JTAG chain...")
 
-        # Run Vivado in batch mode
-        cmd = [vivado_path, "-mode", "batch", "-source", str(tcl_path)]
+        # Run Vivado in batch mode (with environment setup)
+        cmd = build_tool_command(vivado_path, "-mode", "batch", "-source", str(tcl_path))
         result = subprocess.run(
             cmd,
             capture_output=True,
@@ -322,35 +323,6 @@ def _parse_zynq_device(device_name: str) -> ZynqDevice | None:
     )
 
 
-def _get_vivado_path(vitis_path: str) -> str | None:
-    """Find the Vivado executable path.
-
-    Args:
-        vitis_path: Vitis installation path.
-
-    Returns:
-        Path to Vivado executable, or None if not found.
-    """
-    path = shutil.which("vivado")
-    if path:
-        return path
-    if vitis_path:
-        candidate = Path(vitis_path) / "bin" / "vivado"
-        if candidate.exists():
-            return str(candidate)
-        candidate = Path(vitis_path) / "bin" / "vivado.exe"
-        if candidate.exists():
-            return str(candidate)
-    common_paths = [
-        "/opt/xilinx/bin/vivado",
-        os.path.expanduser("~/Xilinx/Vivado/bin/vivado"),
-    ]
-    for p in common_paths:
-        if os.path.isfile(p):
-            return p
-    return None
-
-
 def get_zynq_status_dict(result: ZynqCheckResult) -> dict:
     """Convert a ZynqCheckResult to a serializable dictionary.