Rebrand: polkadot → pezkuwi build fixes

- Fixed TypeScript type assertion issues
- Updated imports from api-augment/substrate to api-augment/bizinikiwi
- Fixed imgConvert.mjs header and imports
- Added @ts-expect-error for runtime-converted types
- Fixed all @polkadot copyright headers to @pezkuwi

backend/integration-tests/kyc.test.js

@@ -1,5 +1,5 @@
 import request from 'supertest';
-import { ApiPromise, WsProvider, Keyring } from '@polkadot/api';
+import { ApiPromise, WsProvider, Keyring } from '@pezkuwi/api';
 import { app, supabase } from '../src/server.js';
 
 // ========================================