chore(examples): migrate from Parcel to Vite

[dhayab]

Summary

• Migrated all 24 Parcel-based examples to Vite 5.0.7
• Bumped Vite from 2.x to 5.0.7 in the 7 existing Vite examples
• Normalized all vite configs to .mjs extension and port 1234
• Added missing "start" script to react-instantsearch and vue examples
• Updated READMEs referencing localhost:3000 to localhost:1234

This enables examples to work in StackBlitz (WebContainers), which cannot load native Node addons required by Parcel (lmdb, @parcel/source-map).

All examples have been checked manually for build and runtime errors

PR chain

1. chore: bump node version from 14 to 22 #1340
2. chore(examples): migrate from Parcel to Vite #1341 ← you are here
3. chore: replace codesandbox ci with pkg.pr.new #1339

[dhayab]

Don't mind the failure on codesandbox, it is replaced with pkg.pr.new in #1339