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

bizinikiwi/pezframe/staking-async/src/ledger.rs

@@ -67,7 +67,7 @@ pub struct UnlockChunk<Balance: HasCompact + MaxEncodedLen> {
 ///
 /// TODO: move struct definition and full implementation into `/src/ledger.rs`. Currently
 /// leaving here to enforce a clean PR diff, given how critical this logic is. Tracking issue
-/// <https://github.com/pezkuwichain/pezkuwi-sdk/issues/21>.
+/// <https://github.com/pezkuwichain/pezkuwi-sdk/issues/191>.
 #[derive(
 	PartialEqNoBound,
 	EqNoBound,
@@ -194,7 +194,7 @@ impl<T: Config> StakingLedger<T> {
 		// further spoil the ledger's state. A bond is in bad state when the bonded controller is
 		// associated with a different ledger (i.e. a ledger with a different stash).
 		//
-		// See <https://github.com/pezkuwichain/pezkuwi-sdk/issues/128> for more details.
+		// See <https://github.com/pezkuwichain/pezkuwi-sdk/issues/273> for more details.
 		ensure!(
 			Bonded::<T>::get(&stash) == Some(controller) && ledger.stash == stash,
 			Error::<T>::BadState
@@ -303,7 +303,7 @@ impl<T: Config> StakingLedger<T> {
 		if let Some(bonded_ledger) = Ledger::<T>::get(&self.stash) {
 			// there is a ledger bonded by the stash. In this case, the stash of the bonded ledger
 			// should be the same as the ledger's stash. Otherwise fail to prevent data
-			// inconsistencies. See <https://github.com/pezkuwichain/pezkuwi-sdk/issues/117> for more
+			// inconsistencies. See <https://github.com/pezkuwichain/pezkuwi-sdk/issues/262> for more
 			// details.
 			ensure!(bonded_ledger.stash == self.stash, Error::<T>::BadState);
 		}

bizinikiwi/pezframe/staking-async/src/pezpallet/impls.rs

@@ -1795,7 +1795,7 @@ impl<T: Config> Pezpallet<T> {
 	/// * A bonded (stash, controller) pair must have an associated ledger.
 	///
 	/// NOTE: these checks result in warnings only. Once
-	/// <https://github.com/pezkuwichain/pezkuwi-sdk/issues/128> is resolved, turn warns into check
+	/// <https://github.com/pezkuwichain/pezkuwi-sdk/issues/273> is resolved, turn warns into check
 	/// failures.
 	fn check_bonded_consistency() -> Result<(), TryRuntimeError> {
 		use alloc::collections::btree_set::BTreeSet;