Fix winreg import on Linux — conditional import for Windows only

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: theflexa

src/pywebflx/cli.py

@@ -12,12 +12,13 @@
 from __future__ import annotations
 
 import asyncio
-import json
 import subprocess
 import sys
-import winreg
 from pathlib import Path
 
+if sys.platform == "win32":
+    import winreg
+
 import click
 
 from pywebflx import __version__