astro@6.1.7

#16027 c62516b Thanks @fkatsuhiro! - Fixes a bug where remote image dimensions were not validated during static builds on Netlify.
#16311 94048f2 Thanks @Arecsu! - Fixes --port flag being ignored after a Vite-triggered server restart (e.g. when a .env file changes)
#16316 0fcd04c Thanks @ematipico! - Fixes the /_image endpoint accepting an arbitrary f=svg query parameter and serving non-SVG content as image/svg+xml. The endpoint now validates that the source is actually SVG before honoring f=svg, matching the same guard already enforced on the component path.