Milstolpe 1: skelett — Fastify-backend med login, Vue-frontend (mörkt Jellyseerr-tema), Dockerfile

- backend: /api/health, /api/login|logout|session, sessionscookie,
  timingSafeEqual-lösenordskoll, allt annat under /api kräver inloggning,
  serverar byggd frontend med SPA-fallback; 4 tester (node:test)
- frontend: Vue 3 + Vite, login-sida, Upptäck-skal, sökfält (stub),
  mörkt tema enligt Jellyseerr-förlagan
- docker: multi-stage arm64-image; config-plumbing för Lidarr/Jellyfin/
  Gemini via env (Jellyfin-historik prioriterad som signal per Björn)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01824ZrvG2mDYYrmwqypLNup

docker/Dockerfile

@@ -0,0 +1,24 @@
+# Multi-stage: frontend-bygge -> backend-deps -> slim runtime (arm64 på Pi5)
+ARG BUILD_CPUS=2
+
+FROM node:22-slim AS frontend
+WORKDIR /f
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci --no-audit --no-fund
+COPY frontend/ ./
+RUN npm run build
+
+FROM node:22-slim AS backend
+WORKDIR /app
+COPY backend/package.json backend/package-lock.json ./
+RUN npm ci --omit=dev --no-audit --no-fund
+COPY backend/src ./src
+
+FROM node:22-slim
+ENV NODE_ENV=production
+WORKDIR /app
+COPY --from=backend /app ./
+COPY --from=frontend /f/dist ./public
+EXPOSE 3000
+USER node
+CMD ["node", "src/server.js"]