fix(login): move version div under login button and disable HTML caching

dental-server/auth/login.html

@@ -200,10 +200,10 @@
             </div>
             
             <button type="submit" class="btn" id="loginBtn">Entrar</button>
-        </form>
             <div style="text-align: center; margin-top: 20px; color: var(--text-secondary); font-size: 0.85rem; font-weight: 500;">
                 v2.0.3
             </div>
+        </form>
     </div>
 
     <script>

dental-server/server.js

@@ -472,6 +472,7 @@ async function serveHtmlWithCacheBuster(res, filePath) {
     content = content.replace(/href="([^"]+\.css)(?:\?v=[^"]*)?"/g, `href="$1?v=${APP_VERSION}"`);
     
     res.set('Content-Type', 'text/html');
+    res.set('Cache-Control', 'no-store, no-cache, must-revalidate, private');
     res.send(content);
   } catch (err) {
     console.error('Erro ao ler HTML:', err);