refactor: rename passkeyChallenge to webauthnChallenge

- Renamed table for consistency with webauthnCredentials
- Created migration script 1.8.1.ts for table rename
- Updated schema definitions in SQLite and PostgreSQL
- Maintains WebAuthn standard naming convention

server/index.ts

@@ -35,7 +35,7 @@ declare global {
         interface Request {
             apiKey?: ApiKey;
             user?: User;
-            session?: Session;
+            session: Session;
             userOrg?: UserOrg;
             apiKeyOrg?: ApiKeyOrg;
             userOrgRoleId?: number;