feat: add Vue 2/3 and Angular example apps

[fadi-george]

Description

Add modern Vite-based example apps for Vue 2, Vue 3, and Angular alongside the existing React example, standardize the per-example setup flow, and switch all dev servers to port 4000 with locally-trusted HTTPS.

Details

• Add src/static/vue/v2/example/, src/static/vue/v3/example/, and src/static/onesignal-ngx/example/ apps following the same shape as the React example
• Modernize the Vue 3 example from Vue CLI to Vite
• Standardize scripts/setup.sh across React/Vue/Angular: pack the parent SDK as a fixed-name tarball and install it via vp install --force to avoid duplicate package.json entries
• Add HTTPS for React/Vue via vite-plugin-mkcert, and for Angular via a scripts/start.sh wrapper that uses mkcert certs when available (and falls back to Angular's self-signed cert otherwise)
• Move all example dev servers to port 4000
• Fix scripts/copy-build-to-outputs.sh to keep bun.lock files in outputs/ while still pruning .angular/ cache dirs and stray *.tgz tarballs

Testing

I tested all four examples end-to-end and confirmed each one builds, installs the freshly packed parent SDK, serves on localhost:4000 over HTTPS, and loads OneSignal without errors.

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