feat(admin): Add admin authentication and user management

sentinel-dashboard/Dockerfile

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+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
+
+EXPOSE 8080
+CMD ["java", "-Dserver.port=8080", "-Dcsp.sentinel.dashboard.server=localhost:8080", "-jar", "/sentinel-dashboard.jar"]