Initial commit: Visigine (Vite client + Express/SQLite backend)

Container-ready via docker/ compose (frontend nginx + backend Node). Compose adjusted for Coolify on the prod server: frontend uses expose:80 (no host binding — host 8080 is taken by the Coolify proxy; Traefik routes visigine.de), backend ALLOWED_ORIGINS=https://visigine.de. Secrets stay in server/.env (git-ignored); see server/.env.example.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docker/backend.Dockerfile

@@ -0,0 +1,38 @@
+# Visigine backend — Node 20 Express API.
+# Build context is the repo root (see docker-compose.yml).
+#
+# Two-stage build: stage 1 has python+make+g++ for compiling better-sqlite3's
+# native bindings; stage 2 is a slim runtime that copies just the resolved
+# node_modules so the final image stays small.
+
+# ── stage 1: build native deps ────────────────────────────────────
+FROM node:20-alpine AS deps
+WORKDIR /app
+
+# Build toolchain for better-sqlite3 (and any future native module).
+RUN apk add --no-cache python3 make g++ libc6-compat
+
+COPY server/package.json server/package-lock.json* ./
+RUN npm ci --omit=dev && npm cache clean --force
+
+# ── stage 2: runtime ─────────────────────────────────────────────
+FROM node:20-alpine AS runtime
+
+ENV NODE_ENV=production
+WORKDIR /app
+
+# better-sqlite3's compiled .node binary links against libstdc++ at runtime.
+RUN apk add --no-cache libstdc++
+
+COPY --from=deps /app/node_modules ./node_modules
+COPY server/ .
+
+EXPOSE 3001
+
+# Light-weight healthcheck — busybox wget ships with alpine.
+# Use 127.0.0.1 explicitly: alpine resolves `localhost` to ::1 by default
+# and our Node listener only binds IPv4 (0.0.0.0).
+HEALTHCHECK --interval=30s --timeout=5s --retries=3 --start-period=10s \
+  CMD wget --spider --quiet http://127.0.0.1:3001/health || exit 1
+
+CMD ["node", "index.js"]