[PIE-14] More robust API proxy (!7)

Finally! Using an Astro API Route to handle all the queries which works like a dream. Also created a custom function to get the relative path for image files, fixing any external access issues.
Co-authored-by: june <self@breadone.net>
Co-committed-by: june <self@breadone.net>

src/components/Detail/ImageCarousel.astro

@@ -4,7 +4,7 @@ const { class: className, recipe } = Astro.props
 
 async function getLink(img: string) {
     const record = await client.collection("images").getOne(img)
-    const link = await client.files.getURL(record, record.image)
+    const link = await client.files.getRelativeURL(record, record.image)
     return link
 }