fix: use current/bin/vp directly in install.sh instead of trampoline

Run env setup through the real binary (current/bin/vp) rather than
the trampoline (bin/vp). This avoids the running-exe self-overwrite
issue on Windows and is consistent with install.ps1's approach.

Author: fengmk2

packages/cli/install.sh

@@ -663,9 +663,11 @@ NPMRC_EOF
   cleanup_old_versions
 
   # Create env files with PATH guard (prevents duplicate PATH entries)
-  local vp_bin="$INSTALL_DIR/bin/vp"
+  # Use current/bin/vp directly (the real binary) instead of bin/vp (trampoline)
+  # to avoid the self-overwrite issue on Windows during --refresh
+  local vp_bin="$INSTALL_DIR/current/bin/vp"
   if [[ "$platform" == win32* ]]; then
-    vp_bin="$INSTALL_DIR/bin/vp.exe"
+    vp_bin="$INSTALL_DIR/current/bin/vp.exe"
   fi
   "$vp_bin" env setup --env-only > /dev/null