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

src/Models/Server.php

@@ -211,12 +211,31 @@ class Server
             return 'owner';
         }
 
-        $assignment = $this->db->fetch(
+        $direct = $this->db->fetch(
             'SELECT role FROM server_user WHERE server_id = ? AND user_id = ?',
             [$serverId, $userId]
         );
 
-        return $assignment ? $assignment['role'] : null;
+        $teamRole = $this->db->fetch(
+            'SELECT ts.role FROM team_user tu
+             JOIN team_server ts ON tu.team_id = ts.team_id
+             WHERE tu.user_id = ? AND ts.server_id = ?
+             ORDER BY FIELD(ts.role, \'manager\', \'viewer\')
+             LIMIT 1',
+            [$userId, $serverId]
+        );
+
+        $directRole = $direct ? $direct['role'] : null;
+        $teamRoleValue = $teamRole ? $teamRole['role'] : null;
+
+        if ($directRole === 'manager' || $teamRoleValue === 'manager') {
+            return 'manager';
+        }
+        if ($directRole === 'viewer' || $teamRoleValue === 'viewer') {
+            return 'viewer';
+        }
+
+        return null;
     }
 
     public function getAccessibleServerIds(int $userId): array
@@ -231,6 +250,13 @@ class Server
             [$userId]
         );
 
+        $teamServerIds = $this->db->fetchAll(
+            'SELECT DISTINCT ts.server_id FROM team_user tu
+             JOIN team_server ts ON tu.team_id = ts.team_id
+             WHERE tu.user_id = ?',
+            [$userId]
+        );
+
         $ids = [];
         foreach ($owned as $row) {
             $ids[] = (int) $row['id'];
@@ -238,6 +264,9 @@ class Server
         foreach ($assigned as $row) {
             $ids[] = (int) $row['server_id'];
         }
+        foreach ($teamServerIds as $row) {
+            $ids[] = (int) $row['server_id'];
+        }
 
         return array_unique($ids);
     }