refactor: bundle connect-history-api-fallback

[chenjiahan]

Summary

This PR switches connect-history-api-fallback to a typed dynamic import so the server bundle can load it without relying on a runtime external. It also moves the package into devDependencies and adds the matching type package to keep the build self-contained.

Testing

• pnpm build
• pnpm lint

Related Links

None

[Copilot]

Pull request overview

This PR makes connect-history-api-fallback load via a typed dynamic import so it can be included in the server build output rather than relied on as a runtime external.

Changes:

• Replace require('connect-history-api-fallback') with await import('connect-history-api-fallback') (typed via @types/connect-history-api-fallback).
• Stop externalizing connect-history-api-fallback in the server build config to allow bundling it.
• Move connect-history-api-fallback to devDependencies and add its type package.

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
src/server.ts	Switches history API fallback middleware loading from require to dynamic import() and aligns middleware typing.
rslib.config.ts	Removes connect-history-api-fallback from externals so it can be bundled into the server output.
package.json	Moves connect-history-api-fallback to devDependencies and adds @types/connect-history-api-fallback.
pnpm-lock.yaml	Lockfile updates for the dependency move and added type packages.

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

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