feat(docker): switch to Ubuntu base, enable DWG→DXF conversion via libredwg-tools

Dockerfile

@@ -1,11 +1,12 @@
-# Stage 1: Dependencies
-FROM node:20-alpine AS deps
+
+# Stage 1: Dependencies (Ubuntu base)
+FROM node:20-bookworm AS deps
 WORKDIR /app
 COPY package.json package-lock.json ./
 RUN npm ci
 
 # Stage 2: Build
-FROM node:20-alpine AS builder
+FROM node:20-bookworm AS builder
 WORKDIR /app
 COPY --from=deps /app/node_modules ./node_modules
 COPY . .
@@ -23,16 +24,23 @@ RUN npx prisma generate
 
 RUN npm run build
 
-# Stage 3: Runner
-FROM node:20-alpine AS runner
+# Stage 3: Runner (Ubuntu base)
+FROM node:20-bookworm AS runner
 WORKDIR /app
 
 ENV NODE_ENV=production
 
-# GDAL/ogr2ogr for GeoPackage export,
-# ghostscript+qpdf for extreme PDF compression (direct, not via Stirling)
-# Note: libredwg not available in Alpine repos — DWG→DXF disabled in Docker
-RUN apk add --no-cache gdal gdal-tools ghostscript qpdf
+# Install dependencies for all features
+# - gdal/ogr2ogr for GeoPackage export
+# - ghostscript+qpdf for extreme PDF compression
+# - libredwg for DWG→DXF conversion
+RUN apt-get update && \
+		apt-get install -y --no-install-recommends \
+			gdal-bin ghostscript qpdf build-essential git ca-certificates libredwg-tools && \
+		rm -rf /var/lib/apt/lists/*
+
+# Note: DWG→DXF conversion now enabled via libredwg (dwg2dxf)
+# If libredwg-tools is missing, manual build from source may be required
 
 RUN addgroup --system --gid 1001 nodejs
 RUN adduser --system --uid 1001 nextjs