Astro adds experimental advanced routing

This is a meaningful shift for Astro: it moves from file-based routing into a more programmable server pipeline without abandoning its existing mental model.

• –`src/app.ts` becomes the entrypoint for SSR requests, so teams can insert auth, logging, rate limits, or custom response handling at precise points
• –`astro/fetch` is the minimal path for people who want direct control over the request lifecycle
• –`astro/hono` is the pragmatic move: it lowers adoption friction for Hono users and makes Astro easier to fit into middleware-heavy stacks
• –The feature is still experimental, so early adopters should expect API churn, but the direction is clear: Astro wants a bigger role in full-stack app infrastructure
• –This is especially relevant for projects that like Astro’s frontend story but need more serious server-side routing control