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/team.php

@@ -0,0 +1,60 @@
+<?php $servers = $servers ?? []; ?>
+
+<div class="page-header">
+    <div class="page-header-left">
+        <h1 class="page-title">Team Management</h1>
+        <p class="page-subtitle">Manage who has access to your servers</p>
+    </div>
+</div>
+
+<div class="card">
+    <div class="card-body">
+        <?php if (empty($servers)): ?>
+            <div class="empty-state">
+                <i class="fas fa-users-cog"></i>
+                <p>You don't own any servers yet.</p>
+                <p class="text-muted">Servers you create will appear here so you can manage their team access.</p>
+                <a href="/servers/create" class="btn btn-primary">Add Server</a>
+            </div>
+        <?php else: ?>
+            <div class="table-responsive">
+                <table class="table">
+                    <thead>
+                        <tr>
+                            <th>Server</th>
+                            <th>IP Address</th>
+                            <th>Status</th>
+                            <th>Team Members</th>
+                            <th>Actions</th>
+                        </tr>
+                    </thead>
+                    <tbody>
+                        <?php foreach ($servers as $server): ?>
+                            <tr>
+                                <td>
+                                    <a href="/servers/<?= $server['id'] ?>">
+                                        <?= htmlspecialchars($server['name']) ?>
+                                    </a>
+                                </td>
+                                <td><code><?= htmlspecialchars($server['ip_address']) ?></code></td>
+                                <td>
+                                    <span class="status-badge status-<?= $server['status'] ?? 'unknown' ?>">
+                                        <?= ucfirst($server['status'] ?? 'unknown') ?>
+                                    </span>
+                                </td>
+                                <td>
+                                    <span class="badge badge-info"><?= $server['member_count'] ?> members</span>
+                                </td>
+                                <td>
+                                    <a href="/team/<?= $server['id'] ?>" class="btn btn-sm">
+                                        <i class="fas fa-users"></i> Manage Team
+                                    </a>
+                                </td>
+                            </tr>
+                        <?php endforeach; ?>
+                    </tbody>
+                </table>
+            </div>
+        <?php endif; ?>
+    </div>
+</div>