feat: 搭建后端多租户名片服务

- 初始化 Spring Boot 多模块工程与通用基础能力

- 增加租户、组织、用户、名片、文件、统计等业务模块

- 补充数据库迁移脚本与基础测试

backend/Dockerfile

@@ -0,0 +1,42 @@
+# syntax=docker/dockerfile:1.7
+
+FROM --platform=${BUILDPLATFORM} maven:3.9.9-eclipse-temurin-21 AS builder
+
+WORKDIR /build
+
+COPY backend/pom.xml ./pom.xml
+COPY backend/easycard-common/pom.xml ./easycard-common/pom.xml
+COPY backend/easycard-module-system/pom.xml ./easycard-module-system/pom.xml
+COPY backend/easycard-module-tenant/pom.xml ./easycard-module-tenant/pom.xml
+COPY backend/easycard-module-org/pom.xml ./easycard-module-org/pom.xml
+COPY backend/easycard-module-user/pom.xml ./easycard-module-user/pom.xml
+COPY backend/easycard-module-card/pom.xml ./easycard-module-card/pom.xml
+COPY backend/easycard-module-file/pom.xml ./easycard-module-file/pom.xml
+COPY backend/easycard-module-stat/pom.xml ./easycard-module-stat/pom.xml
+COPY backend/easycard-boot/pom.xml ./easycard-boot/pom.xml
+
+RUN mvn -q -DskipTests dependency:go-offline
+
+COPY backend/. .
+
+RUN mvn -q -DskipTests -pl easycard-boot -am clean package \
+    && cp /build/easycard-boot/target/easycard-boot-0.1.0-SNAPSHOT.jar /tmp/app.jar \
+    && rm -rf /tmp/manifest-check \
+    && mkdir -p /tmp/manifest-check \
+    && cd /tmp/manifest-check \
+    && jar xf /tmp/app.jar META-INF/MANIFEST.MF \
+    && grep -q "Main-Class: org.springframework.boot.loader.launch.JarLauncher" META-INF/MANIFEST.MF \
+    && grep -q "Start-Class: com.easycard.boot.EasycardBootApplication" META-INF/MANIFEST.MF
+
+FROM --platform=${TARGETPLATFORM} eclipse-temurin:21-jre
+
+WORKDIR /app
+
+ENV TZ=Asia/Shanghai
+ENV JAVA_OPTS=""
+
+COPY --from=builder /tmp/app.jar /app/app.jar
+
+EXPOSE 8112
+
+ENTRYPOINT ["sh", "-c", "java $JAVA_OPTS -jar /app/app.jar"]