Corrige VNC remoto: proxy via Next.js e fix de hidratação SSR

---

- Adicionado docker/server.mjs, entry point customizado que monkey-patcha http.createServer antes do Next.js standalone subir, injetando handler de upgrade para fazer pipe TCP de WebSocket (ws://host:3000/websockify?token=...) direto para localhost:6080;
- Adicionado src/app/api/novnc/[...path]/route.ts, proxy HTTP dos assets estáticos do noVNC (vnc.html, JS, CSS) para localhost:6080, seguindo o mesmo padrão do proxy HLS;
- Corrigido bug de hidratação SSR em src/app/vnc/[id]/page.tsx: URL do iframe agora é computada apenas client-side via useEffect/useState, usando path relativo /api/novnc/ em vez de http://host:6080/;
- Atualizado config/supervisord.conf para iniciar Next.js com node /opt/server.mjs;
- Atualizado docker/Dockerfile para copiar docker/server.mjs para /opt/server.mjs;

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docker/server.mjs

@@ -0,0 +1,38 @@
+// Custom entry point: patches http.createServer before Next.js starts,
+// so WebSocket upgrade requests to /websockify are proxied to localhost:6080
+// (noVNC/websockify) without exposing that port publicly.
+import http from "node:http"
+import net from "node:net"
+
+const _createServer = http.createServer.bind(http)
+
+function attachWebSocketProxy(server) {
+  server.on("upgrade", (req, socket, head) => {
+    const upstream = net.connect({ host: "127.0.0.1", port: 6080 })
+
+    upstream.once("connect", () => {
+      let raw = `${req.method} ${req.url} HTTP/1.1\r\n`
+      for (const [k, v] of Object.entries(req.headers)) {
+        raw += `${k}: ${Array.isArray(v) ? v.join(", ") : v}\r\n`
+      }
+      raw += "\r\n"
+      upstream.write(raw)
+      if (head?.length) upstream.write(head)
+      socket.pipe(upstream)
+      upstream.pipe(socket)
+    })
+
+    upstream.on("error", () => { try { socket.destroy() } catch {} })
+    socket.on("error", () => { try { upstream.destroy() } catch {} })
+    socket.on("close", () => { try { upstream.destroy() } catch {} })
+    upstream.on("close", () => { try { socket.destroy() } catch {} })
+  })
+}
+
+http.createServer = function (...args) {
+  const server = _createServer(...args)
+  attachWebSocketProxy(server)
+  return server
+}
+
+await import("/app/server.js")