fix(packaging): workaround yauzl/Node 26 hang + fix API bootstrap contract

Packaging was silently hanging forever because yauzl 2.10.0 read streams
emit no data events under Node 26, causing extract-zip to block indefinitely
inside @electron/packager 20. Fix: postinstall script patches
@electron/packager/dist/unzip.js to use bsdtar (libarchive) instead.
bsdtar was chosen over 7z because 7z refuses chained symlinks in macOS
.app framework bundles. Both package:linux and package:mac now produce
correct output.

Also corrects the V3 API bootstrap contract in api_client.ts:
- SearchQuery body was wrapped in an extra {search_query: ...} layer — removed
- x-no-account-id header standardised to 'bypass'
- Redundant x-no-account-id removed from file download headers
- Smoke test rewritten to validate the real two-step bootstrap path

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

package.json

@@ -4,18 +4,20 @@
   "description": "AE Native Launcher V3",
   "main": "dist/main/index.js",
   "scripts": {
+    "postinstall": "node scripts/patch-packager-unzip.js",
     "start": "tsc && electron .",
     "dev": "tsc && electron .",
     "build": "tsc",
     "watch": "tsc -w",
+    "package:linux": "tsc && electron-packager . aether_launcher --platform=linux --arch=x64 --out=builds --overwrite --prune=true",
     "package:mac": "tsc && electron-packager . aether_launcher --platform=darwin --arch=x64,arm64 --out=builds --overwrite --prune=true --icon=resources/img/osit_logo.icns"
   },
   "devDependencies": {
-    "@types/node": "^22.10.7",
-    "electron": "^34.0.0",
-    "electron-packager": "^17.1.2",
+    "@types/node": "^22.19.0",
+    "electron": "^42.0.1",
+    "@electron/packager": "^20.0.0",
     "ts-node": "^10.9.2",
-    "typescript": "^5.7.3"
+    "typescript": "^5.9.3"
   },
   "dependencies": {
     "axios": "^1.13.2"