Add server ownership, team access, role-based UI, and default admin role

- New migration 002_server_access.sql: created_by column + server_user table
- Server model: ownership, permission checks, team management methods
- Routes: /team routes, RoleMiddleware on /servers/create and /admin
- ServerController: permission checks via server_user, team CRUD methods
- TerminalController: server access checks
- DashboardController: filter servers by accessible ones
- ApiController: server access checks
- Views: team.php, team_server.php, sidebar Team link, hide actions by role
- Default user role changed from operator to admin on registration
- Admin user form defaults to admin role

views/servers/index.php

@@ -9,9 +9,11 @@ $groups = $groups ?? [];
         <p class="page-subtitle">Manage your Linux servers</p>
     </div>
     <div class="page-header-right">
+        <?php if (is_admin()): ?>
         <a href="/servers/create" class="btn btn-primary">
             <i class="fas fa-plus"></i> Add Server
         </a>
+        <?php endif; ?>
     </div>
 </div>
 
@@ -45,7 +47,9 @@ $groups = $groups ?? [];
             <div class="empty-state">
                 <i class="fas fa-server"></i>
                 <p>No servers found.</p>
+                <?php if (is_admin()): ?>
                 <a href="/servers/create" class="btn btn-primary">Add Your First Server</a>
+                <?php endif; ?>
             </div>
         <?php else: ?>
             <div class="table-responsive">
@@ -106,6 +110,7 @@ $groups = $groups ?? [];
                                         <a href="/terminal/<?= $server['id'] ?>" class="btn btn-xs" title="Terminal">
                                             <i class="fas fa-terminal"></i>
                                         </a>
+                                        <?php if (is_admin()): ?>
                                         <a href="/servers/<?= $server['id'] ?>/edit" class="btn btn-xs" title="Edit">
                                             <i class="fas fa-edit"></i>
                                         </a>
@@ -113,6 +118,7 @@ $groups = $groups ?? [];
                                                 onclick="deleteServer(<?= $server['id'] ?>, '<?= htmlspecialchars(addslashes($server['name'])) ?>')">
                                             <i class="fas fa-trash"></i>
                                         </button>
+                                        <?php endif; ?>
                                     </div>
                                 </td>
                             </tr>