Drop dead pnpm.onlyBuiltDependencies from package.json

pnpm 11 reads the allowlist from pnpm-workspace.yaml#allowBuilds (added in the v11 bump). The package.json#pnpm.onlyBuiltDependencies key is silently ignored, so leaving it in invites future confusion when someone reads package.json looking for the live source.

Author: d4rken

package.json

@@ -40,11 +40,5 @@
     "typescript": "5.7.2",
     "vite": "6.0.7",
     "vitest": "2.1.8"
-  },
-  "pnpm": {
-    "onlyBuiltDependencies": [
-      "esbuild",
-      "sharp"
-    ]
   }
 }