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/manage_users.html

@@ -129,6 +129,18 @@
                 </label>
             </div>
 
+            <div class="form-group">
+                <label class="form-label">Module Access</label>
+                <div class="module-checkboxes" id="moduleCheckboxes">
+                    {% for module in modules %}
+                    <label class="checkbox-label">
+                        <input type="checkbox" name="modules" value="{{ module.module_id }}" class="module-checkbox">
+                        {{ module.module_name }}
+                    </label>
+                    {% endfor %}
+                </div>
+            </div>
+
             <div class="modal-actions">
                 <button type="button" class="btn btn-secondary" onclick="closeUserModal()">Cancel</button>
                 <button type="submit" class="btn btn-primary">Save User</button>
@@ -162,9 +174,10 @@ function openAddUser() {
     document.getElementById('passwordOptional').style.display = 'none';
     document.getElementById('password').required = true;
     document.getElementById('activeToggleGroup').style.display = 'none';
+    // Uncheck all modules for new user
+    document.querySelectorAll('.module-checkbox').forEach(cb => cb.checked = false);
     document.getElementById('userModal').style.display = 'flex';
 }
-
 function openEditUser(userId) {
     editingUserId = userId;
     document.getElementById('modalTitle').textContent = 'Edit User';
@@ -191,7 +204,22 @@ function openEditUser(userId) {
                 const isEditingSelf = user.user_id === {{ session.user_id }};
                 document.getElementById('role').disabled = isEditingSelf;
                 
-                document.getElementById('userModal').style.display = 'flex';
+                // Load user's modules
+                fetch('/settings/users/' + userId + '/modules')
+                    .then(resp => resp.json())
+                    .then(moduleData => {
+                        // Uncheck all first
+                        document.querySelectorAll('.module-checkbox').forEach(cb => cb.checked = false);
+                        // Check assigned modules
+                        if (moduleData.success) {
+                            moduleData.module_ids.forEach(id => {
+                                const cb = document.querySelector(`.module-checkbox[value="${id}"]`);
+                                if (cb) cb.checked = true;
+                            });
+                        }
+                        // Show modal after modules are loaded
+                        document.getElementById('userModal').style.display = 'flex';
+                    });
             } else {
                 alert(data.message);
             }
@@ -201,7 +229,6 @@ function openEditUser(userId) {
             console.error(error);
         });
 }
-
 function closeUserModal() {
     document.getElementById('userModal').style.display = 'none';
     document.getElementById('userForm').reset();
@@ -234,8 +261,23 @@ document.getElementById('userForm').addEventListener('submit', function(e) {
     .then(response => response.json())
     .then(data => {
         if (data.success) {
-            closeUserModal();
-            location.reload();
+            // Save modules if editing existing user
+            if (userId) {
+                const moduleIds = Array.from(document.querySelectorAll('.module-checkbox:checked'))
+                    .map(cb => parseInt(cb.value));
+                
+                fetch(`/settings/users/${userId}/modules`, {
+                    method: 'POST',
+                    headers: { 'Content-Type': 'application/json' },
+                    body: JSON.stringify({ module_ids: moduleIds })
+                }).then(() => {
+                    closeUserModal();
+                    location.reload();
+                });
+            } else {
+                closeUserModal();
+                location.reload();
+            }
         } else {
             alert(data.message);
         }