Scope Vite dev exports in dev/vite entry

[markdalgleish]

This PR adds a @react-router/dev/vite entry so that all Vite-related exports don't need to be namespaced or aliased. We avoided this in the past because we didn't use package exports to limit reaching into package internals, but since we now define package exports, we're free to make this change.

-import {
-  vitePlugin as reactRouter,
-  cloudflareDevProxyVitePlugin,
-} from "@react-router/dev";

+import {
+  reactRouter,
+  cloudflareDevProxy,
+} from "@react-router/dev/vite";

[changeset-bot]

🦋 Changeset detected

Latest commit: 39edb2c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 8 packages

Name	Type
@react-router/dev	Major
react-router	Major
react-router-dom	Major
@react-router/architect	Major
@react-router/cloudflare	Major
@react-router/express	Major
@react-router/node	Major
@react-router/serve	Major

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[github-actions]

🤖 Hello there,

We just published version 6.28.2-pre.0 which includes this pull request. If you'd like to take it for a test run please try it out and let us know what you think!

Thanks!