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

shared/lib/usdt.ts

@@ -3,7 +3,7 @@
 // ========================================
 // Handles wUSDT minting, burning, and reserve management
 
-import type { ApiPromise } from '@polkadot/api';
+import type { ApiPromise } from '@pezkuwi/api';
 import { ASSET_IDS, ASSET_CONFIGS } from './wallet';
 import { getMultisigMembers, createMultisigTx } from './multisig';