@astrojs/cloudflare: default imageService generates 404s with static output

Astro info

Astro                    v6.4.2
Node                     v22.21.0
System                   Linux (x64)
Package manager          pnpm
Output                   static
Adapter                  @astrojs/cloudflare
Integrations             none (fresh project)

Describe the Bug

When using @astrojs/cloudflare adapter with static output (output: 'static'), the default image service generates runtime /_image?href=... URLs instead of static optimized image files. This causes all images to return 404 when deployed to Cloudflare Workers since there's no runtime handler for the /_image endpoint in static mode.

The issue occurs specifically when:

1. Using adapter: cloudflare() (default settings, no imageService specified)
2. Using <Image /> component from astro:assets
3. Building with output: 'static'
4. Deploying to Cloudflare Workers

Expected behavior: Static .webp files should be generated at build time and referenced directly in HTML.

Actual behavior: HTML contains /_image?href=%2F_astro%2F...&w=...&h=...&f=webp URLs that return 404.

What's the expected result?

With adapter: cloudflare({ imageService: 'compile' }), images work correctly:

• Build generates static .webp files in dist/client/_astro/
• HTML references: src="/_astro/blog-placeholder-1.xxxxx.webp"
• Images load successfully after deployment

The default behavior (adapter: cloudflare()) should either:

1. Automatically detect static output mode and use compile-time optimization, OR
2. Be documented that imageService: 'compile' is required for static deployment

Link to Minimal Reproducible Example

https://stackblitz.com/github/withastro/astro/tree/main/examples/blog?file=astro.config.mjs

Steps to reproduce locally:

# Create new project with blog template
pnpm create cloudflare@latest --framework=astro
# Select "Blog" template, deploy to "Workers with Assets"

# Add Cloudflare adapter (if not already added)
pnpx astro add cloudflare

# Build (static output is default for blog template)
pnpm run build

# Deploy
pnpx wrangler deploy

# Check deployed site - all images 404

Participation

• I am willing to submit a pull request for this issue.