Replace old team system with work teams (equipos de trabajo)

- New migration 003_teams.sql: teams, team_user, team_server tables
- New Team model with CRUD, members, and server assignment
- New TeamController with full team management
- New views: teams/index, teams/create, teams/show
- Server model: getUserRole and getAccessibleServerIds now include team-based access
- Sidebar: Teams link under Administration (admin+ only)
- Routes: old /team routes removed, new /teams routes added
- Removed old ServerController team methods and views
- Fixed sidebar empty accessible IDs returning all servers
- Fixed dashboard and API to show empty when no accessible servers

views/teams/create.php

@@ -0,0 +1,36 @@
+<div class="page-header">
+    <div class="page-header-left">
+        <div class="back-link">
+            <a href="/teams"><i class="fas fa-arrow-left"></i> Back to Teams</a>
+        </div>
+        <h1 class="page-title">Create Team</h1>
+        <p class="page-subtitle">Create a work team to manage server access</p>
+    </div>
+</div>
+
+<div class="card">
+    <div class="card-body">
+        <form method="POST" action="/teams/create" class="form" style="max-width:600px">
+            <input type="hidden" name="_csrf_token" value="<?= $this->csrfToken() ?>">
+
+            <div class="form-group">
+                <label for="name">Team Name *</label>
+                <input type="text" id="name" name="name" class="form-input"
+                       placeholder="e.g., DevOps, Developers, Support" required>
+            </div>
+
+            <div class="form-group">
+                <label for="description">Description</label>
+                <textarea id="description" name="description" class="form-input" rows="3"
+                          placeholder="Optional description of the team"></textarea>
+            </div>
+
+            <div class="form-group">
+                <button type="submit" class="btn btn-primary">
+                    <i class="fas fa-save"></i> Create Team
+                </button>
+                <a href="/teams" class="btn btn-secondary">Cancel</a>
+            </div>
+        </form>
+    </div>
+</div>