feat: ATM10-Statistikportal

Statistikportal für den All-the-Mods-10-Server (Minecraft 1.21.1, NeoForge 21.1):

- mod/: serverseitige NeoForge-Mod atmstats – Ereignisse, Live-Zähler, Servergesundheit,
  FTB-Dateien; Outbox auf der Festplatte, signierter gzip-Versand per HTTPS mit Backoff
- backend/: Fastify + PostgreSQL – idempotenter Ingest, Projektionen, Parser für SNBT,
  FTB Quests/Teams, world/stats, world/advancements und latest.log; Ranglisten, Snapshots,
  Retention, öffentliche API, SSE-Live-Updates, Admin mit argon2/CSRF, SFTP-Worker
- web/: Next.js-Dashboard – Übersicht, Ranglisten, Spielerprofile, ATM10, Server,
  Datenquellen, Verwaltung
- shared/: Protokoll v1 und API-Typen; tools/: Simulator, Log-Anonymisierer, RCON-Client
- deploy/: Docker Compose hinter Traefik, Backup; docs/: Architektur, Datenquellen, Betrieb

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

backend/Dockerfile

@@ -0,0 +1,35 @@
+# Build context: repository root (docker build -f backend/Dockerfile .)
+FROM node:22-alpine AS build
+WORKDIR /repo
+COPY package.json package-lock.json ./
+COPY shared/package.json shared/
+COPY backend/package.json backend/
+COPY web/package.json web/
+COPY tools/simulator/package.json tools/simulator/
+RUN npm ci --workspace backend --include-workspace-root
+COPY tsconfig.base.json ./
+COPY shared shared
+COPY backend backend
+RUN npm run build -w backend
+
+FROM node:22-alpine AS deps
+WORKDIR /repo
+COPY package.json package-lock.json ./
+COPY shared/package.json shared/
+COPY backend/package.json backend/
+COPY web/package.json web/
+COPY tools/simulator/package.json tools/simulator/
+RUN npm ci --workspace backend --omit=dev && npm cache clean --force
+
+FROM node:22-alpine
+ENV NODE_ENV=production
+WORKDIR /app
+COPY --from=deps /repo/node_modules ./node_modules
+COPY --from=build /repo/backend/dist ./dist
+COPY backend/migrations ./migrations
+COPY backend/config ./config
+COPY backend/package.json ./package.json
+USER node
+EXPOSE 3001
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s CMD wget -qO- http://127.0.0.1:3001/api/health || exit 1
+CMD ["node", "dist/server.js"]