[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/data/pocketbase.ts

@@ -1,5 +1,12 @@
 import Pocketbase from "pocketbase"
 
-const client = new Pocketbase(import.meta.env.PUBLIC_URL)
+const client = new Pocketbase("http://localhost:4321")
 client.autoCancellation(false)
+
+// Return a relative url for file instead of full path including localhost, which breaks external access
+client.files.getRelativeURL = (record: { [key: string]: any; }, filename: string, queryParams?: FileOptions | undefined) => {
+    const res = client.files.getURL(record, filename)
+    return res.substring(21)
+}
+
 export default client;