fix: prevent dev server crashes during HMR updates

[o-az]

ensures the dev server always continues running with cached config when file edits errors occur, without crashing and killing the process. This handles live edits to config files too.

changes:

• implement handleHotUpdate in virtual-config, virtual-routes, virtual-blog
• add error boundaries to all HMR handlers
• replace server.restart() with moduleGraph.invalidateModule()
• add config caching with fallback to last-known-good config
• add debouncing and error deduplication
• add event handler cleanup

[vercel]

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[pkg-pr-new]

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npm i https://pkg.pr.new/wevm/vocs@348

commit: e1ec07f