feat: enhance desktop packaging process with self-contained harness verification

- Updated README and README.zh to clarify packaging commands and added verification step.
- Improved packaging scripts to automatically build the self-contained runtime and verify its integrity.
- Introduced new scripts for verifying harness self-containment and booting the web profile.
- Added comprehensive tests for relinking harness symlinks and ensuring self-containment.
- Updated package.json scripts to reflect new build and verification processes.

apps/desktop/package.json

@@ -16,6 +16,9 @@
     "build": "tsc -b tsconfig.json && pnpm run build:preload",
     "build:preload": "esbuild src/preload.ts --bundle --platform=node --format=cjs --external:electron --outfile=lib/types/preload.cjs",
     "build:harness": "node scripts/build-harness.mjs",
+    "verify:harness": "node scripts/verify-harness.mjs",
+    "pack:dir": "electron-builder --dir",
+    "verify:packed": "node scripts/verify-harness.mjs --app dist",
     "generate-release-json": "node scripts/generate-release-json.mjs",
     "stage-release": "node scripts/stage-release.mjs",
     "typecheck": "tsc -b tsconfig.json",