feat: Add comprehensive admin user management system

- Add user status toggle (activate/deactivate) functionality
- Add user deletion with post/comment transfer to admin
- Implement safety checks for admin protection
- Add interactive JavaScript for user management actions
- Update admin users interface with action buttons
- Add confirmation dialogs for destructive operations
- Update README with new admin features and capabilities
- Add database migration utility for future updates

Features:
- Toggle user active/inactive status
- Delete users with content preservation
- Transfer all posts/comments to admin on user deletion
- Prevent admin self-modification and deletion
- AJAX-powered interface with real-time feedback
- Comprehensive error handling and user notifications

app/templates/admin/users.html

@@ -74,8 +74,17 @@
                                     <i class="fas fa-eye"></i>
                                 </a>
                                 {% if not user.is_admin or current_user.id != user.id %}
-                                    <button class="btn btn-sm btn-outline-warning" title="Toggle Status" disabled>
-                                        <i class="fas fa-toggle-on"></i>
+                                    <button class="btn btn-sm btn-outline-warning" 
+                                            title="{{ 'Deactivate User' if user.is_active else 'Activate User' }}"
+                                            onclick="toggleUserStatus({{ user.id }}, '{{ user.nickname }}', {{ user.is_active|lower }})">
+                                        <i class="fas fa-{{ 'toggle-on' if user.is_active else 'toggle-off' }}"></i>
+                                    </button>
+                                {% endif %}
+                                {% if not user.is_admin and current_user.id != user.id %}
+                                    <button class="btn btn-sm btn-outline-danger" 
+                                            title="Delete User"
+                                            onclick="confirmDeleteUser({{ user.id }}, '{{ user.nickname }}', {{ user.posts.count() }})">
+                                        <i class="fas fa-trash"></i>
                                     </button>
                                 {% endif %}
                             </div>
@@ -134,4 +143,88 @@
     </div>
 </div>
 {% endif %}
+
+<script>
+    function toggleUserStatus(userId, nickname, currentStatus) {
+        const action = currentStatus ? 'deactivate' : 'activate';
+        const message = `Are you sure you want to ${action} user "${nickname}"?`;
+        
+        if (confirm(message)) {
+            fetch(`/admin/users/${userId}/toggle-status`, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                }
+            })
+            .then(response => response.json())
+            .then(data => {
+                if (data.success) {
+                    showAlert(data.message, 'success');
+                    setTimeout(() => {
+                        location.reload();
+                    }, 1000);
+                } else {
+                    showAlert(data.message || 'An error occurred', 'danger');
+                }
+            })
+            .catch(error => {
+                console.error('Error:', error);
+                showAlert('An error occurred while updating user status', 'danger');
+            });
+        }
+    }
+
+    function confirmDeleteUser(userId, nickname, postsCount) {
+        let message = `Are you sure you want to delete user "${nickname}"?`;
+        if (postsCount > 0) {
+            message += `\n\nThis user has ${postsCount} post(s) that will be transferred to you as the admin.`;
+        }
+        message += '\n\nThis action cannot be undone.';
+        
+        if (confirm(message)) {
+            fetch(`/admin/users/${userId}/delete`, {
+                method: 'POST',
+                headers: {
+                    'Content-Type': 'application/json',
+                }
+            })
+            .then(response => response.json())
+            .then(data => {
+                if (data.success) {
+                    showAlert(data.message, 'success');
+                    setTimeout(() => {
+                        location.reload();
+                    }, 1000);
+                } else {
+                    showAlert(data.message || 'An error occurred', 'danger');
+                }
+            })
+            .catch(error => {
+                console.error('Error:', error);
+                showAlert('An error occurred while deleting user', 'danger');
+            });
+        }
+    }
+
+    function showAlert(message, type) {
+        // Create alert container if it doesn't exist
+        let alertContainer = document.querySelector('.alert-container');
+        if (!alertContainer) {
+            alertContainer = document.createElement('div');
+            alertContainer.className = 'alert-container mt-3';
+            document.querySelector('.container-fluid').insertBefore(
+                alertContainer, 
+                document.querySelector('.container-fluid').firstChild
+            );
+        }
+        
+        alertContainer.innerHTML = `
+            <div class="alert alert-${type} alert-dismissible fade show" role="alert">
+                ${message}
+                <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
+            </div>
+        `;
+    }
+</script>
+
 {% endblock %}