fix: include linux-x64 in pnpm supportedArchitectures for rolldown binding

Ensures @rolldown/binding-linux-x64-gnu is fetched even when installing
on a non-linux host, fixing the nixpacks Docker build.

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

package.json

@@ -15,6 +15,13 @@
     "vue": "^3.5.30",
     "vue-router": "4"
   },
+  "pnpm": {
+    "supportedArchitectures": {
+      "os": ["current", "linux"],
+      "cpu": ["current", "x64"],
+      "libc": ["current", "glibc"]
+    }
+  },
   "devDependencies": {
     "@types/luxon": "^3.7.1",
     "@vitejs/plugin-vue": "^6.0.5",