.dockerignore

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+**/node_modules
+**/dist
+**/build
+**/.dart_tool
+**/coverage
+.git
+**/*.log
+# Secrets: passed at runtime via env_file / bind mount, never baked in.
+backend/.env
+backend/serviceAccount.json

Dockerfile

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+# syntax=docker/dockerfile:1
+
+# --- 1. Flutter web build -------------------------------------------------
+FROM ghcr.io/cirruslabs/flutter:stable AS web
+WORKDIR /src
+COPY client/app/pubspec.yaml client/app/pubspec.lock ./
+RUN flutter pub get
+COPY client/app/ ./
+RUN flutter build web --release
+
+# --- 2. Backend build --------------------------------------------------------
+FROM node:20-bookworm-slim AS api-build
+WORKDIR /src
+COPY backend/package.json backend/package-lock.json ./
+RUN npm ci
+COPY backend/ ./
+RUN npx prisma generate && npm run build
+
+# --- 3. Runtime ------------------------------------------------------------
+FROM node:20-bookworm-slim AS runtime
+ENV NODE_ENV=production
+WORKDIR /app
+# Prisma needs OpenSSL at runtime.
+RUN apt-get update && apt-get install -y --no-install-recommends openssl \
+  && rm -rf /var/lib/apt/lists/*
+COPY --from=api-build /src/node_modules ./node_modules
+COPY --from=api-build /src/dist ./dist
+COPY --from=api-build /src/prisma ./prisma
+# The Flutter web build; app.module reads WEB_CLIENT_DIR.
+COPY --from=web /src/build/web ./web
+ENV WEB_CLIENT_DIR=/app/web
+EXPOSE 3000
+# Apply pending migrations, then boot.
+CMD ["sh", "-c", "npx prisma migrate deploy && node dist/main.js"]

docker-compose.yml

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+services:
+  db:
+    image: postgres:16-alpine
+    environment:
+      POSTGRES_USER: postgres
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_DB: kcapp
+    volumes:
+      - pgdata:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U postgres -d kcapp"]
+      interval: 5s
+      timeout: 5s
+      retries: 10
+
+  api:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    depends_on:
+      db:
+        condition: service_healthy
+    # All non-DB config comes from backend/.env (needs Docker Compose v2,
+    # which strips surrounding quotes). DATABASE_URL and the FCM credential
+    # path are overridden below for the container.
+    env_file:
+      - backend/.env
+    environment:
+      DATABASE_URL: postgresql://postgres:postgres@db:5432/kcapp?schema=public
+      PORT: "3000"
+      GOOGLE_APPLICATION_CREDENTIALS: /app/serviceAccount.json
+      APP_BASE_URL: http://localhost:3000
+    ports:
+      - "3000:3000"
+    volumes:
+      # Firebase service account — kept out of the image, mounted read-only.
+      - ./backend/serviceAccount.json:/app/serviceAccount.json:ro
+
+volumes:
+  pgdata: