feat(plugins): Salas como add-on por conta (pessoa-cêntrico) + Visualizar como biomédico

Superadmin / Visualizar como:
- adiciona BIOMÉDICO(A) à lista de preview do superadmin
- enterPreview ativa os plugins (RX/Salas/Profissionais) p/ teste; exitPreview restaura

Locação de Salas — ativação POR USUÁRIO (independe de clínica):
- backend: tabela usuario_plugins + GET/POST /api/me/plugins (authGuard, sem tenant)
- sala continua dona=owner_usuario_id (pessoa) + salaID, clinica_id opcional
- backend.ts: getMyPlugins/setMyPlugin/hydrateMyPlugins; login + App montam o hydrate
- isViewAllowed: 'salas' liberado se plugin ativo na conta; catálogo 'plugins' p/ não-paciente
- Sidebar: entrada ADD-ONS/PLUGINS p/ papéis operacionais ativarem
- PluginsView: toggle de locacao-salas persiste no servidor
- escopo: só locacao-salas é server-backed (RX/Profissionais seguem localStorage)

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

frontend/components/Sidebar.tsx

@@ -1,7 +1,7 @@
 import React from 'react';
 import {
   Users, Calendar as CalendarIcon, LayoutDashboard,
-  DollarSign, RefreshCw, Activity, BookOpen, Award, Megaphone, LogOut, ClipboardList, Bell, Building2, User, BarChart3, Settings, FileText, Puzzle, ScanLine, Monitor, UsersRound, GraduationCap, UserSearch, Briefcase, TrendingUp, Eye, FlaskConical, DoorOpen
+  DollarSign, RefreshCw, Activity, BookOpen, Award, Megaphone, LogOut, ClipboardList, Bell, Building2, User, BarChart3, Settings, FileText, Puzzle, ScanLine, Monitor, UsersRound, GraduationCap, UserSearch, Briefcase, TrendingUp, Eye, FlaskConical, DoorOpen, Sparkles
 } from 'lucide-react';
 import { ToothIcon } from './ToothIcon.tsx';
 import { HybridBackend } from '../services/backend.ts';
@@ -43,6 +43,10 @@ export const Sidebar: React.FC<SidebarProps> = ({ activeTab, setActiveTab }) =>
   if (activePluginIds.includes('profissionais-marketplace') && currentRole !== 'superadmin' && currentRole !== 'paciente') {
     pluginMenuItems.push({ id: 'marketplace-profissionais', label: 'PROFISSIONAIS', icon: UserSearch, color: '#ea580c' });
   }
+  // Catálogo de add-ons (por conta): qualquer usuário operacional pode abrir p/ ativar (ex.: Salas).
+  if (currentRole !== 'superadmin' && currentRole !== 'paciente') {
+    pluginMenuItems.push({ id: 'plugins', label: 'ADD-ONS / PLUGINS', icon: Puzzle, color: '#64748b' });
+  }
 
   const menuItems = [
     { id: 'superadmin-overview',     label: 'VISÃO GERAL',   icon: TrendingUp },
@@ -163,6 +167,7 @@ export const Sidebar: React.FC<SidebarProps> = ({ activeTab, setActiveTab }) =>
             {[
               { role: 'donoclinica', label: 'DONO DE CLÍNICA', icon: Building2 },
               { role: 'dentista',    label: 'DENTISTA',        icon: ToothIcon },
+              { role: 'biomedico',   label: 'BIOMÉDICO(A)',    icon: Sparkles },
               { role: 'protetico',   label: 'PROTÉTICO',       icon: FlaskConical },
               { role: 'paciente',    label: 'PACIENTE',        icon: User },
             ].map(({ role, label, icon: Icon }) => (