Update API and WebSocket base URLs to use environment variables for better configuration management

docker/Dockerfile

@@ -0,0 +1,44 @@
+# MangTool 前后端单容器构建
+# 阶段1：构建前端
+FROM node:20-alpine AS frontend-builder
+WORKDIR /app/frontend
+
+COPY frontend/package.json frontend/package-lock.json ./
+RUN npm ci --ignore-scripts
+
+COPY frontend/ ./
+# 生产环境使用相对路径，与后端同源
+ENV VITE_API_BASE_URL=
+RUN npm run build
+
+# 阶段2：构建后端（含前端静态资源）
+FROM maven:3.8-eclipse-temurin-8-alpine AS backend-builder
+WORKDIR /app
+
+# 复制后端源码
+COPY backend/pom.xml ./
+RUN mvn dependency:go-offline -B
+
+COPY backend/ ./
+# 从阶段1 复制前端构建产物到 Spring Boot 静态目录
+COPY --from=frontend-builder /app/frontend/dist ./src/main/resources/static
+
+RUN mvn package -DskipTests -B
+
+# 阶段3：运行镜像
+FROM eclipse-temurin:8-jre-alpine
+WORKDIR /app
+
+RUN apk add --no-cache tzdata wget \
+    && cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
+    && echo "Asia/Shanghai" > /etc/timezone
+
+COPY --from=backend-builder /app/target/*.jar app.jar
+
+EXPOSE 8080
+
+# 健康检查
+HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
+  CMD wget --quiet --tries=1 --spider http://localhost:8080/api/health || exit 1
+
+ENTRYPOINT ["java", "-jar", "app.jar"]