Inital Work, web server broke again, trying to get scale and rotation setup

backend/Dockerfile

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+# ---------- Stage 1: build frontend ----------
+FROM node:20-bookworm-slim AS fe
+
+WORKDIR /fe
+RUN corepack enable && corepack prepare pnpm@9.12.0 --activate
+
+# deps
+COPY frontend/package.json ./
+RUN pnpm install --no-frozen-lockfile
+
+# sources
+COPY frontend/index.html ./
+COPY frontend/vite.config.ts ./
+COPY frontend/src ./src
+
+# build to /fe/dist
+RUN pnpm run build
+
+
+# ---------- Stage 2: backend + slicer ----------
+FROM node:20-bookworm-slim
+
+# OS deps: Qt libs for Orca + native build deps for better-sqlite3 + tini
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    libglib2.0-0 \
+    libx11-6 libxext6 libxrender1 libsm6 \
+    libxkbcommon0 libfontconfig1 libfreetype6 libnss3 libxi6 libxrandr2 \
+    libxfixes3 libdrm2 libxdamage1 libxcomposite1 libwayland-client0 libxcb1 \
+    python3 make g++ libsqlite3-dev \
+    curl tini \
+  && rm -rf /var/lib/apt/lists/*
+
+WORKDIR /app
+RUN corepack enable && corepack prepare pnpm@9.12.0 --activate
+
+# backend deps
+COPY backend/package.json ./
+RUN pnpm install --no-frozen-lockfile
+
+# backend sources
+COPY backend/tsconfig.json ./
+COPY backend/src ./src
+RUN pnpm exec tsc
+
+# copy built frontend from stage 1
+COPY --from=fe /fe/dist /app/www
+
+# slicer AppImage (from repo root; compose build.context must be repo root)
+COPY slicer/ /app/slicer/
+RUN set -eux; \
+    F="$(ls -1 /app/slicer | head -n1)"; \
+    test -n "$F"; \
+    chmod +x "/app/slicer/$F"; \
+    cd /app/slicer; \
+    "/app/slicer/$F" --appimage-extract; \
+    ln -sf /app/slicer/squashfs-root/AppRun /app/slicer/orca
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    ca-certificates \
+    libglib2.0-0 \
+    libx11-6 libxext6 libxrender1 libsm6 \
+    libxkbcommon0 libfontconfig1 libfreetype6 libnss3 libxi6 libxrandr2 \
+    libxfixes3 libdrm2 libxdamage1 libxcomposite1 libwayland-client0 libxcb1 \
+    python3 make g++ libsqlite3-dev \
+    curl tini \
+    # 👇 add these for libGL.so.1 (Mesa)
+    libgl1 libgl1-mesa-dri libglu1-mesa \
+  && rm -rf /var/lib/apt/lists/*   
+    
+# runtime dirs
+RUN mkdir -p /app/data/uploads /app/data/outputs /app/profiles
+
+# env
+ENV QT_QPA_PLATFORM=offscreen
+ENV NODE_ENV=production
+ENV SLICER_CMD=/app/slicer/orca
+ENV LIBGL_ALWAYS_SOFTWARE=1
+# Orca 2.3.1 CLI template (plate-sliced 3MF)
+ENV SLICER_ARGS="--debug 2 --arrange 1 --load-settings {MACHINE};{PROCESS} --load-filaments {FILAMENT} --slice 0 --export-3mf {OUTPUT} {INPUT}"
+ENV SUPPORTS_ON=--support-material
+ENV SUPPORTS_OFF=--no-support-material
+
+EXPOSE 8080
+ENTRYPOINT ["/usr/bin/tini","--"]
+CMD ["node","dist/server.js"]