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/perwerde.live.test.js

@@ -7,7 +7,7 @@
  *  2. The node must have the `perwerde` pallet included.
  */
 
-import { ApiPromise, WsProvider, Keyring } from '@polkadot/api';
+import { ApiPromise, WsProvider, Keyring } from '@pezkuwi/api';
 
 // ========================================
 // TEST CONFIGURATION