Add MrTerm Web: self-hosted browser version (Docker Compose) with user accounts, per-user vaults encrypted by the login password, the desktop UI over WebSocket, SFTP upload/download over HTTP; share backend channels between Android and web (src/core/backend.js)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Dockerfile

@@ -0,0 +1,29 @@
+# MrTerm Web – die MrTerm-Oberfläche im Browser, selbst gehostet.
+#   docker compose up -d   →   http://<server>:8080 (beim ersten Aufruf Admin-Konto anlegen)
+
+# ---- Build: Server samt ssh2/ws in eine Datei bündeln
+FROM node:22-alpine AS build
+WORKDIR /src
+COPY package.json package-lock.json ./
+RUN npm ci --ignore-scripts --no-audit --no-fund
+COPY src ./src
+RUN npx esbuild src/web/server.js --bundle --platform=node --target=node22 --minify --legal-comments=none \
+      --external:electron --external:cpu-features --external:bufferutil --external:utf-8-validate \
+      --outfile=dist/server.js
+
+# ---- Laufzeit: nur Node, gebündelter Server und die Dateien der Oberfläche
+FROM node:22-alpine
+ENV NODE_ENV=production PORT=8080 DATA_DIR=/data MRTERM_ROOT=/app
+WORKDIR /app
+COPY package.json ./
+COPY --from=build /src/dist/server.js dist/server.js
+COPY src/i18n.js src/i18n.js
+COPY src/renderer src/renderer
+COPY src/web/public src/web/public
+COPY --from=build /src/node_modules/@xterm node_modules/@xterm
+RUN mkdir -p /data && chown node:node /data
+USER node
+VOLUME /data
+EXPOSE 8080
+HEALTHCHECK --interval=30s --timeout=5s CMD wget -qO- http://127.0.0.1:8080/healthz >/dev/null || exit 1
+CMD ["node", "dist/server.js"]