Pre-bundle astro/fetch and astro/hono in Cloudflare optimizeDeps (#16914)

## Goal
Eliminate the 'new dependencies optimized: astro/fetch' warning during dev
in the Cloudflare adapter. The advanced routing feature (d69f858475, #16366)
introduced astro/fetch and astro/hono exports, and the Cloudflare handler
entry points (01aa1648ef, #16729) import from them — but neither commit
added these to the optimizeDeps.include list. Vite discovers them at runtime
and triggers a late re-optimization.

## Decisions
- Added both astro/fetch and astro/hono: the Cloudflare adapter imports from
  both (hono.ts imports FetchState from astro/fetch, and astro/hono is used
  similarly). Pre-bundling both prevents the same issue for either entry point.

## Changes
- packages/integrations/cloudflare/src/index.ts: added astro/fetch and
  astro/hono to the server environment optimizeDeps.include array, alongside
  the existing astro/app and astro/app/fetch/default-handler entries.