Migrate to Chromium, unified VNC, thumbnails, autologin CDP detection

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- Migrado base Docker de ubuntu:22.04 + Google Chrome para debian:bookworm-slim + Chromium
- Dockerfile refatorado com multi-stage build (node:22-alpine builder + debian runtime) e single RUN layer para imagem menor
- VNC unificado: removido novnc por stream, substituído por websockify global na porta 6080 com token-based routing
- Implementado sistema de thumbnails por stream via ffmpeg (captura do HLS) com endpoint GET/POST e atualização no card
- Autologin reescrito com detecção via Chrome DevTools Protocol: pula credenciais se já autenticado
- Adicionado padrão desiredState (running/stopped) persistido no JSON, restaurado via restore-streams.sh ao reiniciar container
- UI traduzida para inglês, formulário reorganizado com tooltips, seção avançada colapsável e GOP automático
- Player simplificado: modos HLS e HTML unificados, removido modo m3u8 separado
- Adicionado campo threads no ffmpeg; suporte a seccomp:unconfined no docker-compose

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LICENSE

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+MIT License
+
+Copyright (c) 2026 Kralot
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.