fix: remove optionalDependencies from source package.json

Native platform packages (nitro-graphql-darwin-arm64 etc.) are only published
during the release workflow, so optionalDependencies must be added dynamically
at publish time, not in the source package.json.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: productdevbook

package.json

@@ -243,13 +243,6 @@
     "vitest": "catalog:",
     "ws": "catalog:"
   },
-  "optionalDependencies": {
-    "nitro-graphql-darwin-arm64": "2.0.0-beta.70",
-    "nitro-graphql-darwin-x64": "2.0.0-beta.70",
-    "nitro-graphql-linux-x64-gnu": "2.0.0-beta.70",
-    "nitro-graphql-linux-arm64-gnu": "2.0.0-beta.70",
-    "nitro-graphql-win32-x64-msvc": "2.0.0-beta.70"
-  },
   "overrides": {
     "graphql": "^16.13.1",
     "nitro": "^3.0.1-alpha.2"