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/token-wrapper.live.test.js

@@ -8,8 +8,8 @@
  *  3. Test accounts must be funded with the native currency (e.g., PEZ).
  */
 
-import { ApiPromise, WsProvider, Keyring } from '@polkadot/api';
-import { BN } from '@polkadot/util';
+import { ApiPromise, WsProvider, Keyring } from '@pezkuwi/api';
+import { BN } from '@pezkuwi/util';
 import { jest } from '@jest/globals';
 
 // ========================================