feat: ShootTracker SQLite+JWT+YOLOv8

Dockerfile

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+# ─── ShootTracker — Application principale ────────────────────────────────────
+# Multi-stage : Build frontend React → Build backend Node.js → Runtime
+
+# ─── Stage 1 : Build frontend React ──────────────────────────────────────────
+FROM node:20-alpine AS frontend-builder
+
+WORKDIR /app/frontend
+COPY frontend/package*.json ./
+RUN npm install --include=dev
+
+COPY frontend/ ./
+RUN npm run build
+
+# ─── Stage 2 : Build backend Node.js ─────────────────────────────────────────
+FROM node:20-alpine AS backend-builder
+
+WORKDIR /app/backend
+COPY backend/package*.json ./
+RUN npm install
+
+COPY backend/ ./
+RUN npm run build
+
+# ─── Stage 3 : Runtime ────────────────────────────────────────────────────────
+FROM node:20-alpine AS runtime
+
+WORKDIR /app
+
+# Copier node_modules et build backend
+COPY --from=backend-builder /app/backend/node_modules ./node_modules
+COPY --from=backend-builder /app/backend/dist ./dist
+COPY --from=backend-builder /app/backend/package.json ./
+
+# Copier le frontend buildé (servi par Express)
+COPY --from=frontend-builder /app/frontend/dist ./public
+
+# Créer les dossiers de données (volume monté en prod)
+RUN mkdir -p /app/data/uploads
+
+ENV NODE_ENV=production
+ENV PORT=3001
+# JWT_SECRET doit être injecté via variable d'environnement au runtime
+
+HEALTHCHECK --interval=30s --timeout=10s --start-period=20s --retries=3 \
+    CMD wget -qO- http://localhost:3001/api/health || exit 1
+
+EXPOSE 3001
+
+# Volume pour SQLite DB + uploads (persistant entre les redémarrages)
+VOLUME ["/app/data"]
+
+CMD ["node", "dist/index.js"]