refactor: bundle http-proxy-middleware

[chenjiahan]

Summary

This PR bundles http-proxy-middleware into the server build instead of treating it as a runtime external. It also narrows the internal proxy middleware typing so the lazy-loaded middleware and websocket upgrade path stay compatible after bundling.

[Copilot]

Pull request overview

This PR updates the server build/package setup so http-proxy-middleware is bundled into the server output (rather than treated as a runtime external), while adjusting the internal proxy middleware typing to stay compatible with the lazy-loaded middleware and WebSocket upgrade handling.

Changes:

• Bundle http-proxy-middleware by removing it from server externals and moving it from dependencies to devDependencies.
• Switch proxy loading from require('http-proxy-middleware') to a lazy await import('http-proxy-middleware') to align with bundling/code-splitting.
• Narrow internal proxy middleware types to connect-next’s NextHandleFunction and adjust related casts for the websocket-upgrade path.

Reviewed changes

Copilot reviewed 4 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/types.ts	Stops importing/re-exporting http-proxy-middleware’s RequestHandler type from the shared internal types module.
src/server.ts	Lazily imports http-proxy-middleware and updates internal proxy/websocket proxy typing to NextHandleFunction.
rslib.config.ts	Removes http-proxy-middleware from the server bundle externals so it will be bundled.
package.json	Moves http-proxy-middleware from dependencies to devDependencies to reflect bundling.
pnpm-lock.yaml	Lockfile update reflecting the dependency move.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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