Refactor to manager-centric model, add team calendar for all users

Key changes:
- Removed office-centric model (deleted offices.py, office-rules)
- Renamed to team-rules, managers are part of their own team
- Team calendar visible to all (read-only for employees)
- Admins can have a manager assigned

frontend/pages/landing.html

@@ -12,7 +12,7 @@
         <div class="auth-card">
             <div class="auth-header">
                 <h1>Parking Manager</h1>
-                <p>Manage office presence and parking assignments</p>
+                <p>Manage team presence and parking assignments</p>
             </div>
 
             <div style="display: flex; flex-direction: column; gap: 1rem;">
@@ -23,10 +23,25 @@
     </div>
 
     <script>
-        // Redirect if already logged in
-        if (localStorage.getItem('access_token')) {
-            window.location.href = '/presence';
+        // Redirect if already logged in (JWT token or Authelia)
+        async function checkAndRedirect() {
+            // Check JWT token first
+            if (localStorage.getItem('access_token')) {
+                window.location.href = '/presence';
+                return;
+            }
+
+            // Check Authelia (backend will read headers)
+            try {
+                const response = await fetch('/api/auth/me');
+                if (response.ok) {
+                    window.location.href = '/presence';
+                }
+            } catch (e) {
+                // Not authenticated, stay on landing
+            }
         }
+        checkAndRedirect();
     </script>
 </body>
 </html>