Add Pezkuwi SDK UI - Polkadot.js Apps clone

- Clone Polkadot.js Apps repository
- Update package.json with Pezkuwi branding
- Add Pezkuwi endpoint to production chains (wss://pezkuwichain.app:9944)
- Create comprehensive README for SDK UI
- Set up project structure with all packages

Next steps:
- Apply Kurdistan colors (Kesk, Sor, Zer, Spi + Black) to UI theme
- Replace logos with Pezkuwi branding
- Test build and deployment

pezkuwi-sdk-ui/packages/react-hooks/src/useCacheKey.ts

@@ -0,0 +1,31 @@
+// Copyright 2017-2025 @polkadot/react-hooks authors & contributors
+// SPDX-License-Identifier: Apache-2.0
+
+import { useCallback, useMemo } from 'react';
+import store from 'store';
+
+import { useApi } from './useApi.js';
+
+// create a chain-specific key for the local cache
+// FIXME Since we use generics, this cannot be a createNamedHook as of yet
+export function useCacheKey <T> (storageKeyBase: string): [(defaultValue?: T) => T | undefined, (value: T) => T] {
+  const { api, isDevelopment } = useApi();
+  const storageKey = useMemo(
+    () => `${storageKeyBase}:${isDevelopment ? 'development' : api.genesisHash.toHex()}`,
+    [api, isDevelopment, storageKeyBase]
+  );
+
+  // FIXME both these want "T"... incorrect
+
+  const getter = useCallback(
+    (): T | undefined => store.get(storageKey) as T,
+    [storageKey]
+  );
+
+  const setter = useCallback(
+    (value: T): T => store.set(storageKey, value) as T,
+    [storageKey]
+  );
+
+  return [getter, setter];
+}