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/my_counts.html

@@ -6,7 +6,7 @@
 <div class="dashboard-container">
     <div class="page-header">
         <div>
-            <a href="{{ url_for('dashboard') }}" class="breadcrumb">← Back to Dashboard</a>
+            <a href="{{ url_for('counting.index') }}" class="breadcrumb">← Back to Sessions</a>
             <h1 class="page-title">My Active Counts</h1>
             <p class="page-subtitle">{{ count_session.session_name }}</p>
             {% if not count_session.master_baseline_timestamp %}