diff --git a/Dockerfile b/Dockerfile
index ea8ac03..4bab5c1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -17,11 +17,14 @@ WORKDIR /app
 
 ENV NODE_ENV=production \
     PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1
+    PYTHONUNBUFFERED=1 \
+    TZ=Asia/Shanghai
 
-# Alpine 使用国内镜像，加速 apk 安装（python3/py3-pip）
+# Alpine 使用国内镜像，加速 apk 安装（python3/py3-pip）并设置时区为 Asia/Shanghai（与宿主机保持一致）
 RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories \
-    && apk add --no-cache python3 py3-pip
+    && apk add --no-cache python3 py3-pip tzdata \
+    && ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
+    && echo "Asia/Shanghai" > /etc/timezone
 
 COPY --from=build /app/node_modules ./node_modules
 COPY --from=build /app/dist ./dist
diff --git a/backend/Dockerfile b/backend/Dockerfile
index 7c69ae8..b84dee5 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -3,11 +3,16 @@ FROM docker.m.daocloud.io/library/python:3.11-slim
 WORKDIR /app
 
 ENV PYTHONDONTWRITEBYTECODE=1 \
-    PYTHONUNBUFFERED=1
+    PYTHONUNBUFFERED=1 \
+    TZ=Asia/Shanghai
 
 COPY backend/requirements.txt .
 
-RUN pip install --no-cache-dir -r requirements.txt
+RUN apt-get update && apt-get install -y --no-install-recommends tzdata \
+    && ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime \
+    && echo "Asia/Shanghai" > /etc/timezone \
+    && pip install --no-cache-dir -r requirements.txt \
+    && apt-get clean && rm -rf /var/lib/apt/lists/*
 
 COPY backend ./backend
 
diff --git a/public/index.html b/public/index.html
index 91132bb..c538ab4 100644
--- a/public/index.html
+++ b/public/index.html
@@ -808,7 +808,8 @@
 
       async function checkHealth() {
         try {
-          const res = await fetch('/health', { cache: 'no-store' });
+          // 通过 /api/ws-status 检测后端是否可用（同时避免某些部署环境未透出 /health）
+          const res = await fetch('/api/ws-status', { cache: 'no-store' });
           if (!res.ok) throw new Error('status ' + res.status);
           const data = await res.json().catch(() => ({}));
           $('health-dot').style.background = '#22c55e';