Adds audit logging and sync management infrastructure

Introduces comprehensive audit trail system with:
- AuditService to track entity changes
- SyncManager for background sync of audit entries
- New CoreEvents for entity and audit tracking
- Simplified sync architecture with event-driven approach

Prepares system for enhanced compliance and change tracking

.claude/settings.local.json

@@ -1,7 +1,12 @@
 {
   "permissions": {
     "allow": [
-      "Bash(npm run build:*)"
+      "Bash(npm run build:*)",
+      "WebSearch",
+      "WebFetch(domain:web.dev)",
+      "WebFetch(domain:caniuse.com)",
+      "WebFetch(domain:blog.rasc.ch)",
+      "WebFetch(domain:developer.chrome.com)"
     ],
     "deny": [],
     "ask": []