feat: add Docker Compose setup for server and web client

.dockerignore

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+**/target
+**/node_modules
+**/dist
+.git
+.github
+.claude
+.idea
+.vscode
+docs
+plans
+*.md
+demo.gif
+repomix-output.xml

docker-compose.yml

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+services:
+  server:
+    build:
+      context: .
+      dockerfile: landlords-server/Dockerfile
+    container_name: caro-server
+    ports:
+      - "1024:1024"  # TCP / Protobuf (CLI client)
+      - "1025:1025"  # WebSocket + static HTTP (web client)
+    restart: unless-stopped
+
+  web-client:
+    build:
+      context: ./web-client
+      dockerfile: Dockerfile
+    container_name: caro-web-client
+    ports:
+      - "8080:80"
+    depends_on:
+      - server
+    restart: unless-stopped

landlords-server/Dockerfile

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+# Build stage: compile server jar with Maven
+FROM maven:3.9-eclipse-temurin-21 AS build
+WORKDIR /build
+
+# Copy parent pom and all module poms first for dependency caching
+COPY pom.xml .
+COPY landlords-common/pom.xml landlords-common/
+COPY landlords-server/pom.xml landlords-server/
+COPY landlords-client/pom.xml landlords-client/
+
+# Copy sources (common + server only — client not needed for runtime)
+COPY landlords-common/src landlords-common/src
+COPY landlords-server/src landlords-server/src
+COPY landlords-client/src landlords-client/src
+COPY protoc-resource protoc-resource
+
+RUN mvn -B -pl landlords-server -am clean package -DskipTests
+
+# Runtime stage
+FROM eclipse-temurin:21-jre-alpine
+WORKDIR /app
+
+COPY --from=build /build/landlords-server/target/landlords-server-1.4.0.jar app.jar
+
+# TCP (protobuf) and WebSocket (WS + static HTTP) ports
+EXPOSE 1024 1025
+
+ENTRYPOINT ["java", "-jar", "app.jar", "-p", "1024"]

web-client/Dockerfile

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+# Build stage: Vite production build
+FROM node:22-alpine AS build
+WORKDIR /build
+
+COPY package.json package-lock.json ./
+RUN npm ci
+
+COPY index.html vite.config.js ./
+COPY public public
+COPY src src
+RUN npm run build
+
+# Runtime stage: nginx serves static assets
+FROM nginx:alpine
+COPY --from=build /build/dist /usr/share/nginx/html
+
+EXPOSE 80