Merge branch 'wt3': WebAuthn enhancements and virtual authenticator

- Enhanced createRegistrationOptions to look up existing users
- Added virtual-authenticator testing package
- Added WebAuthn e2e and unit tests

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api-server/src/utils/passkey-helpers.ts

@@ -40,7 +40,7 @@ export interface ParsedPasskey {
  * Raw passkey row from database
  */
 export interface PasskeyRow {
-  id: number;
+  id: string | number; // Int8 from DB comes as string
   user_id: number;
   credential_id: Uint8Array;
   public_key: Uint8Array;
@@ -64,7 +64,7 @@ export const parsePasskeyRow = (row: PasskeyRow): ParsedPasskey => {
   const publicKeyBytes = new Uint8Array(row.public_key);
 
   return {
-    id: row.id,
+    id: Number(row.id), // Convert Int8 (string) to number
     credentialId: uint8ArrayToBase64url(row.credential_id),
     publicKey: publicKeyBytes,
     counter: Number(row.counter),