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

pezkuwi/node/core/pvf/common/src/worker/security/landlock.rs

@@ -52,7 +52,7 @@ use std::path::{Path, PathBuf};
 /// - ABI V3: kernel 6.2 - Adds ability to prevent file truncation. During execution, can
 ///   prevent attackers from affecting a symlinked artifact. We don't strictly need this as we
 ///   plan to check for file integrity anyway; see
-///   <https://github.com/pezkuwichain/pezkuwi-sdk/issues/107>.
+///   <https://github.com/pezkuwichain/pezkuwi-sdk/issues/253>.
 ///
 /// # Determinism
 ///

pezkuwi/node/core/pvf/common/src/worker/security/seccomp.rs

@@ -34,7 +34,7 @@
 //! reasons.
 //!
 //! Considering `io_uring`'s status discussed above, and that it very likely would get detected
-//! either by our [static analysis](https://github.com/pezkuwichain/pezkuwi-sdk/issues/106) or by
+//! either by our [static analysis](https://github.com/pezkuwichain/pezkuwi-sdk/issues/252) or by
 //! testing, we think it is safe to block it.
 //!
 //! ## Consensus analysis