feat: restrict managers to their own team

- Backend now only returns users, teams, and attendances from a manager's own team.

- Hidden 'Todas as Equipes' filter from manager dashboard.

- Removed manager ability to create or edit teams.

pages/Dashboard.tsx

@@ -253,14 +253,16 @@ export const Dashboard: React.FC = () => {
                   {users.map(u => <option key={u.id} value={u.id}>{u.name}</option>)}
                 </select>
 
-                <select 
-                  className="bg-zinc-50 dark:bg-dark-bg border border-zinc-200 dark:border-dark-border px-3 py-2 rounded-lg text-sm text-zinc-700 dark:text-zinc-200 outline-none focus:ring-2 focus:ring-brand-yellow/20 cursor-pointer hover:border-zinc-300 dark:hover:border-dark-border transition-all"
-                  value={filters.teamId}
-                  onChange={(e) => handleFilterChange('teamId', e.target.value)}
-                >
-                  <option value="all">Todas Equipes</option>
-                  {teams.map(t => <option key={t.id} value={t.id}>{t.name}</option>)}
-                </select>
+                {currentUser?.role !== 'manager' && (
+                  <select 
+                    className="bg-zinc-50 dark:bg-dark-bg border border-zinc-200 dark:border-dark-border px-3 py-2 rounded-lg text-sm text-zinc-700 dark:text-zinc-200 outline-none focus:ring-2 focus:ring-brand-yellow/20 cursor-pointer hover:border-zinc-300 dark:hover:border-dark-border transition-all"
+                    value={filters.teamId}
+                    onChange={(e) => handleFilterChange('teamId', e.target.value)}
+                  >
+                    <option value="all">Todas Equipes</option>
+                    {teams.map(t => <option key={t.id} value={t.id}>{t.name}</option>)}
+                  </select>
+                )}
               </>
             )}