fix: correct operator precedence in install command validation

Fixed issue #335: --pr cannot be used with --version or --commit

The condition "pr and version not in {None, \"nightly\"} or commit" was
evaluated incorrectly due to operator precedence. Added parentheses
to ensure the logic only triggers error when --pr is actually combined
with conflicting flags, not when only --commit is specified.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: xuyucai

comfy_cli/cmdline.py

@@ -325,7 +325,7 @@ def install(
         )
         raise typer.Exit(code=1)
 
-    if pr and version not in {None, "nightly"} or commit:
+    if pr and (version not in {None, "nightly"} or commit):
         rprint("--pr cannot be used with --version or --commit")
         raise typer.Exit(code=1)