fix: use heredoc for nginx config to avoid envsubst issues

railway/start.sh

@@ -16,9 +16,40 @@ if [ -z "$DATA_ENCRYPTION_KEY" ]; then
     export DATA_ENCRYPTION_KEY=$(openssl rand -base64 32)
 fi
 
-# 生成 nginx 配置
+# 生成 nginx 配置（直接写入，避免 envsubst 问题）
 echo "📝 Generating nginx config for port $PORT..."
-envsubst '${PORT}' < /etc/nginx/nginx.conf.template > /etc/nginx/http.d/default.conf
+cat > /etc/nginx/http.d/default.conf << NGINX_EOF
+server {
+    listen $PORT;
+    server_name _;
+    root /usr/share/nginx/html;
+    index index.html;
+
+    gzip on;
+    gzip_types text/plain text/css application/json application/javascript;
+
+    location / {
+        try_files \$uri \$uri/ /index.html;
+    }
+
+    location /api/ {
+        proxy_pass http://127.0.0.1:8081/api/;
+        proxy_http_version 1.1;
+        proxy_set_header Host \$host;
+        proxy_set_header X-Real-IP \$remote_addr;
+        proxy_connect_timeout 300s;
+        proxy_send_timeout 300s;
+        proxy_read_timeout 300s;
+    }
+
+    location /health {
+        return 200 'OK';
+        add_header Content-Type text/plain;
+    }
+}
+NGINX_EOF
+echo "✅ Nginx config generated"
+cat /etc/nginx/http.d/default.conf
 
 # 启动后端（后台运行，端口 8081 避免与 nginx 冲突）
 echo "🔧 Starting backend on port 8081..."