feat: implement audit logs system, request extractor, admin log panel, and dedicated documentation

- Added an enterprise-grade, request-scoped AuditLogger extractor in Axum.
- Configured MongoDB persistence for structured, replayable audit logs (capturing timestamp, user, action, type, payload snapshot, client IP with proxy header support, and User-Agent).
- Created a live Administrator console at /auth/audit to filter and inspect log events.
- Re-architected documentation by moving Design Wiki pages out of /components into a dedicated /docs route.
- Published logging architecture documentation at /docs/logging.

templates/auth/users.html

@@ -13,6 +13,9 @@
             <p class="text-slate-400 text-sm mt-1">Manage system access, toggle roles, and provision credentials</p>
         </div>
         <div class="flex items-center gap-3">
+            <a href="/auth/audit" class="inline-flex items-center justify-center rounded-xl text-xs font-bold transition-all px-4 py-2.5 bg-indigo-650 hover:bg-indigo-600 text-white shadow-md shadow-indigo-600/10">
+                View Audit Logs
+            </a>
             <a href="/auth/register" class="inline-flex items-center justify-center rounded-xl text-xs font-bold transition-all px-4 py-2.5 bg-emerald-600 hover:bg-emerald-500 text-white shadow-md shadow-emerald-500/10">
                 Register New User
             </a>