feat:use local proxy for media

use local proxy for media so that media doesnt need to be requested from
r2 everytime but can be cached locally. this also fixes some csp issues
ive been having.

src/lib/server/r2.ts

@@ -72,3 +72,7 @@ export async function getSignedR2Url(path: string, expiresIn = 3600): Promise<st
 
 	return await getSignedUrl(r2Client, command, { expiresIn });
 }
+
+export function getLocalR2Url(path: string): string {
+	return `/api/media/${path}`;
+}