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/runtime/teyrchains/src/paras/mod.rs

@@ -398,7 +398,7 @@ pub(crate) enum PvfCheckCause<BlockNumber> {
 		/// instead of its relay parent -- in order to keep PVF available in case of chain
 		/// reversions.
 		///
-		/// See https://github.com/pezkuwichain/pezkuwi-sdk/issues/151 for detailed explanation.
+		/// See https://github.com/pezkuwichain/pezkuwi-sdk/issues/294 for detailed explanation.
 		included_at: BlockNumber,
 		/// Whether or not the upgrade should be enacted directly.
 		///
@@ -1464,7 +1464,7 @@ const INVALID_TX_DOUBLE_VOTE: u8 = 3;
 const INVALID_TX_UNAUTHORIZED_CODE: u8 = 4;
 
 /// This is intermediate "fix" for this issue:
-/// <https://github.com/pezkuwichain/pezkuwi-sdk/issues/136>
+/// <https://github.com/pezkuwichain/pezkuwi-sdk/issues/281>
 ///
 /// It does not actually fix it, but makes the worst case better. Without that limit someone
 /// could completely DoS the relay chain by registering a ridiculously high amount of paras.