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

scripts/create_collection_42.js

@@ -9,7 +9,7 @@
  *   node scripts/create_collection_42.js [ws://127.0.0.1:9944]
  */
 
-const { ApiPromise, WsProvider, Keyring } = require('@polkadot/api');
+const { ApiPromise, WsProvider, Keyring } = require('@pezkuwi/api');
 
 async function createCollection42() {
   // Get WebSocket endpoint from args or use default

scripts/register_parachain.js

@@ -1,6 +1,6 @@
 #!/usr/bin/env node
 
-const { ApiPromise, WsProvider, Keyring } = require('@polkadot/api');
+const { ApiPromise, WsProvider, Keyring } = require('@pezkuwi/api');
 const fs = require('fs');
 
 async function main() {