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/.gitignore

@@ -0,0 +1,12 @@
+node_modules/
+dist/
+.env
+*.log
+
+# Dati persistenti dei container (bind mount locali)
+data/postgres/*
+data/redis/*
+data/backups/*
+!data/postgres/.gitkeep
+!data/redis/.gitkeep
+!data/backups/.gitkeep