feat(cli): detect Blume documentation sites

Problem

grab@latest init does not detect documentation sites built with Blume, even though Blume generates an Astro/Vite runtime and supports custom Astro integrations.

Reproduction

From a Blume project:

bunx grab@latest init

✿ React Grab 0.2.0

✔ Preflight checks.
✖ Could not detect a supported framework.

React Grab supports Next.js, Vite, TanStack Start, and Webpack projects.

This repository uses Blume 1.6.6. Its generated runtime is Astro-based, but the project itself has no standard Vite entrypoint for the initializer to inspect.

Expected behavior

The initializer should recognize a Blume project and offer the appropriate setup, or document Blume as a supported Astro/Vite integration.

Current workaround

A Blume site can be integrated manually with an Astro integration that injects the development-only module:

const reactGrab: AstroIntegration = {
  name: "react-grab",
  hooks: {
    "astro:config:setup": ({ injectScript }) => {
      injectScript("page", "if (import.meta.env.DEV) { import('react-grab'); }");
    },
  },
};

Could the CLI detect Blume, for example via blume in dependencies or blume.config.ts, and configure this automatically? CC @haydenbleasel, the Blume maintainer.

Automatically submitted on behalf of the user by an AI agent.