Runtime environment variables now take precedence over build-time values

Environment variable resolution in @clerk/astro now prefers process.env over import.meta.env. This means runtime environment variables (e.g., set in the Node.js adapter or container) take precedence over values statically replaced by Vite at build time.

The new resolution order is:

1. locals.runtime.env (Cloudflare Workers)
2. process.env (Node.js runtime)
3. import.meta.env (Vite build-time static replacement)

Previously, import.meta.env was checked before process.env. If you rely on build-time PUBLIC_* values that differ from your runtime process.env, you may need to update your configuration to ensure the correct values are set in process.env at runtime.