ix: Prevent claim overwriting and improve domain removal safety

Fix critical bugs in domain claim management to ensure data integrity:

- Domain addition: Check for existing claims before adding to prevent duplicates
  - Update user's own claim if it exists instead of creating duplicates
  - Skip update if hash and SSL flag unchanged (idempotent)
  - Never touch other users' claims when updating own claim

- Domain removal: Add strict validation to prevent removing other users' claims
  - Only perform full cleanup (atomicDomainCleanup) when user is confirmed resolved claimant
  - Require consensus status 'resolved' AND resolvedClaimant matches localWriter
  - Improved logging to show which removal path is taken
  - Enhanced removeOwnClaimAndVotes with explicit vote key parsing

- Hash preferences cleanup: Fix module path resolution error
  - Correct require path from admin-backend/cache.js (../../core/core)
  - Add lazy require pattern with error handling to prevent crashes
  - Ensure cleanup runs after consensus updates and domain removals

includes/admin/ui/config.js

@@ -4,7 +4,7 @@ window.updateMap = {
   'update-peers': ['peers'],
   'update-certs': ['certs'],
   'update-interfaces': ['interfaces'],
-  'update-local-dns': ['local-dns', 'dns-conflicts'],
+  'update-local-dns': ['local-dns', 'dns-conflicts', 'p2p-domain-conflicts'],
   'update-holesail': [],
   'update-holesail-clients': [],
   'update-settings': ['settings'],