feat: Rebrand Polkadot/Substrate references to PezkuwiChain

This commit systematically rebrands various references from Parity Technologies'
Polkadot/Substrate ecosystem to PezkuwiChain within the kurdistan-sdk.

Key changes include:
- Updated external repository URLs (zombienet-sdk, parity-db, parity-scale-codec, wasm-instrument) to point to pezkuwichain forks.
- Modified internal documentation and code comments to reflect PezkuwiChain naming and structure.
- Replaced direct references to  with  or specific paths within the  for XCM, Pezkuwi, and other modules.
- Cleaned up deprecated  issue and PR references in various  and  files, particularly in  and  modules.
- Adjusted image and logo URLs in documentation to point to PezkuwiChain assets.
- Removed or rephrased comments related to external Polkadot/Substrate PRs and issues.

This is a significant step towards fully customizing the SDK for the PezkuwiChain ecosystem.

bizinikiwi/client/offchain/README.md

@@ -0,0 +1,18 @@
+Bizinikiwi offchain workers.
+
+The offchain workers is a special function of the runtime that
+gets executed after block is imported. During execution
+it's able to asynchronously submit extrinsics that will either
+be propagated to other nodes or added to the next block
+produced by the node as unsigned transactions.
+
+Offchain workers can be used for computation-heavy tasks
+that are not feasible for execution during regular block processing.
+It can either be tasks that no consensus is required for,
+or some form of consensus over the data can be built on-chain
+for instance via:
+1. Challenge period for incorrect computations
+2. Majority voting for results
+3. etc
+
+License: GPL-3.0-or-later WITH Classpath-exception-2.0