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

scripts/update_issue_links.sh

@@ -0,0 +1,32 @@
+#!/bin/bash
+# Koddaki issue linklerini yeni numaralara günceller
+
+cd /home/mamostehp/pezkuwi-sdk
+
+MAPPING_FILE=".claude/issue_mapping.txt"
+
+echo "=== Updating issue links in code ==="
+
+# Mapping dosyasını oku (header'ları atla)
+while read -r upstream_num pezkuwi_num; do
+  # Boş satır veya yorum satırını atla
+  [[ -z "$upstream_num" || "$upstream_num" == \#* ]] && continue
+
+  # Sadece sayıları işle
+  [[ ! "$upstream_num" =~ ^[0-9]+$ ]] && continue
+
+  # Değişiklik yapılacak dosyaları bul
+  files=$(grep -rl "pezkuwi-sdk/issues/$upstream_num[^0-9]" --include="*.rs" . 2>/dev/null | grep -v target | grep -v vendor | head -20)
+
+  if [ -n "$files" ]; then
+    echo "Upstream #$upstream_num -> Pezkuwi #$pezkuwi_num"
+    for f in $files; do
+      # Tam URL'yi değiştir (sadece tam eşleşme)
+      sed -i "s|pezkuwichain/pezkuwi-sdk/issues/$upstream_num\([^0-9]\)|pezkuwichain/pezkuwi-sdk/issues/$pezkuwi_num\1|g" "$f"
+      sed -i "s|pezkuwichain/pezkuwi-sdk/issues/$upstream_num\$|pezkuwichain/pezkuwi-sdk/issues/$pezkuwi_num|g" "$f"
+    done
+  fi
+done < "$MAPPING_FILE"
+
+echo ""
+echo "=== Done ==="