v0.12.0 - Add modular system architecture with user-based module access

- Add Modules and UserModules database tables
- Create home page with module selection grid
- Implement per-user module assignment in user management
- Add route guards for module access control
- Refactor navigation: login -> home -> modules, admin console via button
- Add Font Awesome icons

templates/admin_dashboard.html

@@ -6,7 +6,10 @@
 <div class="dashboard-container">
     <!-- Mode Selector -->
     <div class="mode-selector">
-    <button class="mode-btn mode-btn-active" data-href="{{ url_for('dashboard') }}">
+    <a href="{{ url_for('home') }}" class="btn btn-secondary btn-sm">
+        <i class="fa-solid fa-arrow-left"></i> Back to Home
+    </a>
+    <button class="mode-btn mode-btn-active" data-href="{{ url_for('admin_dashboard') }}">
         👔 Admin Console
     </button>
     <button class="mode-btn" data-href="{{ url_for('staff_mode') }}">
@@ -38,7 +41,7 @@
     <script>
     function toggleArchived() {
         const checked = document.getElementById('showArchived').checked;
-        window.location.href = '{{ url_for("dashboard") }}' + (checked ? '?show_archived=1' : '');
+        window.location.href = '{{ url_for("admin_dashboard") }}' + (checked ? '?show_archived=1' : '');
     }
     </script>