feat(templates): consolidate admin and profile templates

Add admin_users.templ for user management interface with delete, password
reset, and edit capabilities. Add profile.templ and related components for
user profile management. Remove admin_profile.templ. Update all templates
to use new consolidated API endpoints.

templates/admin.templ

@@ -36,9 +36,9 @@ templ Admin(user User) {
                         <a href="/admin" class="block px-4 py-2 rounded-lg bg-accent text-bg-primary" style="color: var(--text-primary)">
                             🏠 Dashboard
                         </a>
-                        <a href="/admin/profile" class="block px-4 py-2 rounded-lg hover:opacity-80" style="color: var(--text-primary)">
-                            👤 Profile Settings
-                        </a>
+<a href="/profile" class="block px-4 py-2 rounded-lg hover:opacity-80" style="color: var(--text-primary)">
+							👤 Profile Settings
+						</a>
                         <a href="/admin/library" class="block px-4 py-2 rounded-lg hover:opacity-80" style="color: var(--text-primary)">
                             📚 Library Management
                         </a>
@@ -73,7 +73,7 @@ templ Admin(user User) {
                                     <p style="color: var(--text-secondary)" class="text-sm">Configure your preferences</p>
                                 </div>
                             </div>
-                            <a href="/admin/profile" class="mt-4 inline-block text-sm btn-secondary px-3 py-1 rounded">Manage Settings</a>
+                            <a href="/profile" class="mt-4 inline-block text-sm btn-secondary px-3 py-1 rounded">Manage Settings</a>
                         </div>