Fix Docker build by removing vite-plugin dependency (#214)

Removes @cloudflare/vite-plugin from root devDependencies to resolve
turbo prune lockfile mismatch causing CI failures. The plugin is only
used by examples (excluded from Docker builds) and is already in their
package.json files.

Author: ghostwriternr

.changeset/fix-turbo-prune-lockfile.md

@@ -0,0 +1,7 @@
+---
+'@cloudflare/sandbox': patch
+---
+
+Fix Docker build failures caused by turbo prune lockfile mismatch
+
+Remove @cloudflare/vite-plugin from root devDependencies to avoid turbo prune bug with nested optionalDependencies. The vite-plugin is only used by examples which are excluded from Docker builds and already have it in their own package.json.

package-lock.json

@@ -27,7 +27,6 @@
     "@biomejs/biome": "^2.3.2",
     "@changesets/changelog-github": "^0.5.1",
     "@changesets/cli": "^2.29.7",
-    "@cloudflare/vite-plugin": "^1.14.1",
     "@cloudflare/vitest-pool-workers": "^0.10.2",
     "@cloudflare/workers-types": "^4.20251014.0",
     "@types/bun": "^1.3.1",