feat: persist selected provider and keys globally via node backend, remove Claude, Azure, and MiniMax from UI

Dockerfile

@@ -8,8 +8,9 @@ COPY . .
 RUN npm run build
 
 # Estágio de Produção
-FROM nginxinc/nginx-unprivileged:alpine as production-stage
-RUN apk update && apk upgrade --no-cache
-COPY --from=build-stage /app/dist /usr/share/nginx/html
+FROM bitnami/node:22 as production-stage
+WORKDIR /app
+COPY --from=build-stage /app/dist ./dist
+COPY server.js ./
 EXPOSE 8080
-CMD ["nginx", "-g", "daemon off;"]
+CMD ["node", "server.js"]