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/base.html

@@ -49,8 +49,8 @@
 
                 <!-- Navigation Links -->
                 <nav class="flex items-center space-x-4">
-                    <a href="/components" class="text-sm font-medium text-muted-foreground hover:text-white transition py-2 px-3 rounded-lg hover:bg-secondary">
-                        Design Wiki
+                    <a href="/docs" class="text-sm font-medium text-muted-foreground hover:text-white transition py-2 px-3 rounded-lg hover:bg-secondary">
+                        Documentation
                     </a>
                     {% if authenticated %}
                         <a href="/tasks" class="text-sm font-medium text-muted-foreground hover:text-white transition py-2 px-3 rounded-lg hover:bg-secondary">