feat(create): add React PowerSync scaffolding add-on

[devagrawal09]

Summary

• add a new built-in React add-on at packages/create/src/frameworks/react/add-ons/powersync
• scaffold PowerSync metadata, env vars, package additions, provider wiring, schema/connector stubs, demo route, README, and logo
• add vite-plugin integration (powersyncVite()) so generated apps include PowerSync-required Vite worker/dependency config

Verification

• pnpm build
• pnpm test:unit
• pnpm nx affected --target=test:e2e --parallel=3
• node packages/cli/dist/index.js create powersync-app --framework react --add-ons powersync --target-dir /tmp/powersync-ci-verify-YDFAth --no-install --no-git --examples
• in generated app:
  • pnpm install
  • pnpm build

Notes

• BackendConnector is intentionally scaffold-level and still requires project-specific auth + upload implementation.

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