refactor(auth): export resolvePds for reuse

src/auth/verify.ts

@@ -14,7 +14,7 @@ function decodeJwtPayload(token: string): JwtPayload {
   return JSON.parse(atob(payload));
 }
 
-async function resolvePds(did: string): Promise<string> {
+export async function resolvePds(did: string): Promise<string> {
   const res = await fetch(`https://plc.directory/${did}`);
   if (!res.ok) throw new Error(`Failed to resolve DID: ${res.status}`);
   const doc: DidDocument = await res.json();