chore: fix Docker Compose for local full-stack development

backend/Dockerfile

@@ -1,8 +1,18 @@
-FROM node:20-alpine
+# ── Build stage ──────────────────────────────────────────────────────────────
+FROM node:20-alpine AS builder
 WORKDIR /app
 COPY package*.json ./
-RUN npm ci --omit=dev
+# Install all deps (including devDependencies) so tsc is available
+RUN npm ci
 COPY . .
 RUN npm run build
+
+# ── Runtime stage ─────────────────────────────────────────────────────────────
+FROM node:20-alpine
+WORKDIR /app
+COPY package*.json ./
+# Install production deps only for the final image
+RUN npm ci --omit=dev
+COPY --from=builder /app/dist ./dist
 EXPOSE 4000
 CMD ["node", "dist/index.js"]

docker-compose.yml

@@ -19,6 +19,12 @@ services:
       FCM_TOPIC: ${FCM_TOPIC:-freeze_alerts}
     volumes:
       - backend_data:/data
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:4000/health"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+      start_period: 15s
 
   frontend:
     build:
@@ -29,7 +35,8 @@ services:
     ports:
       - "3000:3000"
     depends_on:
-      - backend
+      backend:
+        condition: service_healthy
 
 volumes:
   backend_data: