refactor(project): Reorganize frontend and backend directories

backend/sentinel-dashboard/Dockerfile

@@ -0,0 +1,22 @@
+FROM eclipse-temurin:8-jre
+
+# 下载 Sentinel 1.8.6 官方 JAR
+RUN apt-get update && \
+    apt-get install -y wget && \
+    wget -O /sentinel-dashboard.jar \
+    https://github.com/alibaba/Sentinel/releases/download/1.8.6/sentinel-dashboard-1.8.6.jar && \
+    apt-get remove -y wget && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/*
+
+# 设置时区
+RUN ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && echo "Asia/Shanghai" > /etc/timezone
+
+# 创建启动脚本
+RUN echo '#!/bin/sh\n\
+exec java ${JAVA_OPTS} -Dserver.port=${SERVER_PORT:-8080} -Dcsp.sentinel.dashboard.server=${DASHBOARD_SERVER:-localhost:8080} -Dproject.name=${PROJECT_NAME:-sentinel-dashboard} -jar /sentinel-dashboard.jar\n\
+' > /entrypoint.sh && chmod +x /entrypoint.sh
+
+EXPOSE 8080
+
+ENTRYPOINT ["/entrypoint.sh"]