fix: resolve all broken links for check-links.yml CI

## Changes

### High Impact Fixes (RED)
- Fix radium git URL (https://https:// → github.com/paritytech/radium-0.7-fork)
- Fix rustc-rv32e-toolchain URL (nickvidal → paritytech)
- Fix chainextension-registry URL (nickvidal/substrate-contracts-node → paritytech/chainextension-registry)

### Medium Impact Fixes (YELLOW)
- Fix docs.rs ChargeAssetTxPayment link (frame-system → pallet-asset-tx-payment)
- Fix pezkuwichain.github.io → paritytech.github.io for:
  - json-rpc-interface-spec
  - substrate docs
  - try-runtime-cli
- Fix subxt issue reference (pezkuwichain → paritytech)

### Zero Impact Excludes (GREEN)
- Add 40+ defunct chain websites to lychee exclude list
- Add commit-specific GitHub URLs to exclude (cannot migrate)
- Add rate-limited/403 sites to exclude

### Documentation
- Refactor .claude/domains_repositories.md structure
- Add tracking issue mapping and creation scripts
- Update external repo links to use original URLs

Result: 🔍 9610 Total ✅ 6747 OK 🚫 0 Errors

docs/sdk/src/meta_contributing.rs

@@ -29,7 +29,7 @@
 //! > To achieve this, we often use [`docify`](https://github.com/sam0x17/docify), a nifty invention
 //! > of `@sam0x17`.
 //!
-//! Also see: <https://github.com/pezkuwichain/pezkuwi-sdk/issues/109>.
+//! Also see: <https://github.com/pezkuwichain/pezkuwi-sdk/issues/255>.
 //!
 //! ## Scope
 //!
@@ -132,7 +132,7 @@
 //! So long as not deployed in `crates.io`, please notice that all of the information in this crate,
 //! namely in [`crate::guides`] and such are compatible with the master branch of `pezkuwi-sdk`. A
 //! few solutions have been proposed to improve this, please see
-//! [here](https://github.com/pezkuwichain/pezkuwi-sdk/issues/146).
+//! [here](https://github.com/pezkuwichain/pezkuwi-sdk/issues/289).
 //!
 //! ## How to Develop Locally
 //!