fix: define MACRO.PACKAGE_URL and MACRO.NATIVE_PACKAGE_URL in build

These macros are used in ~10 files (autoUpdater, localInstaller,
nativeInstaller, update CLI) but were not defined in the build script's
`define` block. At runtime, they resolve to `undefined`, causing
commands like `npm install undefined` and `npm view undefined` to fail
silently during auto-update checks.

Sets MACRO.PACKAGE_URL to the published npm package name and
MACRO.NATIVE_PACKAGE_URL to undefined (no native binary distribution).

Relates to #29

Co-Authored-By: Juan Camilo <juancamilo.auriti@gmail.com>

scripts/build.ts

@@ -60,6 +60,8 @@ const result = await Bun.build({
     'MACRO.BUILD_TIME': JSON.stringify(new Date().toISOString()),
     'MACRO.ISSUES_EXPLAINER':
       JSON.stringify('report the issue at https://github.com/anthropics/claude-code/issues'),
+    'MACRO.PACKAGE_URL': JSON.stringify('@gitlawb/openclaude'),
+    'MACRO.NATIVE_PACKAGE_URL': 'undefined',
   },
   plugins: [
     {