server: project config and infrastructure setup

Add package.json (Fastify, Prisma, Redis, JWT), TypeScript config,
Dockerfile, docker-compose with Postgres and Redis services, and
.gitignore with data directory rules.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/Dockerfile

@@ -0,0 +1,33 @@
+# Immagine base: dipendenze complete + client Prisma generato
+FROM node:22-alpine AS base
+WORKDIR /app
+RUN apk add --no-cache openssl
+COPY package*.json ./
+RUN npm ci
+COPY prisma ./prisma
+RUN npx prisma generate
+COPY . .
+
+# Stage di sviluppo: usato da docker-compose.yml (hot reload con tsx)
+FROM base AS dev
+ENV NODE_ENV=development
+EXPOSE 3000
+CMD ["npm", "run", "dev"]
+
+# Stage di build: compila TypeScript in dist/
+FROM base AS build
+RUN npm run build
+
+# Stage di produzione: solo runtime, senza dipendenze dev
+FROM node:22-alpine AS production
+WORKDIR /app
+ENV NODE_ENV=production
+RUN apk add --no-cache openssl
+COPY package*.json ./
+RUN npm ci --omit=dev
+COPY --from=build /app/dist ./dist
+COPY --from=build /app/prisma ./prisma
+COPY --from=build /app/node_modules/.prisma ./node_modules/.prisma
+COPY --from=build /app/node_modules/@prisma/client ./node_modules/@prisma/client
+EXPOSE 3000
+CMD ["node", "dist/server.js"]