fix: add hostArchitectures to PKG Distribution.xml to prevent Rosetta prompt (smart-mcp-proxy#268)

The macOS PKG installer was incorrectly prompting users to install Rosetta
on Apple Silicon Macs, even though all binaries are native arm64.

When using productbuild with a custom Distribution.xml, macOS Installer
does not auto-detect architecture support. Without the hostArchitectures
attribute, it assumes Rosetta is required.

Adding hostArchitectures="arm64,x86_64" to the <options> element tells
macOS Installer that the package supports both architectures natively,
eliminating the unnecessary Rosetta prompt on ARM Macs.

This is a known issue that affected fish-shell, PowerShell, and other
projects using custom Distribution.xml files.

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: Dumbris

scripts/create-pkg.sh

@@ -268,7 +268,7 @@ cat > "$TEMP_DIR/Distribution.xml" << EOF
     <title>MCP Proxy ${VERSION#v}</title>
     <organization>com.smartmcpproxy</organization>
     <domains enable_localSystem="true"/>
-    <options customize="never" require-scripts="true" rootVolumeOnly="true" />
+    <options customize="never" require-scripts="true" rootVolumeOnly="true" hostArchitectures="arm64,x86_64" />
 
     <!-- Define documents displayed at various steps -->
     <welcome file="welcome_en.rtf" mime-type="text/rtf"/>