fix: 前端自动化部署优化

Dockerfile.frontend

@@ -22,8 +22,9 @@ FROM nginx:alpine
 # Copy built assets
 COPY --from=builder /app/dist /usr/share/nginx/html
 
-# Copy custom nginx configuration
-COPY nginx.conf /etc/nginx/conf.d/default.conf
+# Copy nginx configuration template and entrypoint to render from env
+COPY nginx.conf /etc/nginx/conf.d/default.conf.template
+COPY frontend/entrypoint/10-envsubst.sh /docker-entrypoint.d/10-envsubst.sh
 
 # Create log directory
 RUN mkdir -p /var/log/nginx