docs: add docker-compose example for speed limit config

README.md

@@ -143,6 +143,40 @@ docker run ... \
   yangjieshao/rustdesk-api:full-s6-amd64
 ```
 
+**docker-compose 示例：**
+
+```yaml
+version: '3'
+
+services:
+  rustdesk:
+    image: yangjieshao/rustdesk-api:full-s6-amd64
+    ports:
+      - 21114:21114
+      - 21115:21115
+      - 21116:21116
+      - 21116:21116/udp
+      - 21117:21117
+      - 21118:21118
+      - 21119:21119
+    environment:
+      - RELAY=<本机IP:21117>
+      - ENCRYPTED_ONLY=1
+      - TZ=Asia/Shanghai
+      - MUST_LOGIN=Y
+      - RUSTDESK_API_JWT_KEY=<your-secret-key>
+      # 中继限速（单位 Mb/s，不设则用默认值）
+      - LIMIT_SPEED=100
+      - TOTAL_BANDWIDTH=2000
+      - SINGLE_BANDWIDTH=500
+    volumes:
+      - /data/rustdesk/server:/data
+      - /data/rustdesk/api:/app/data
+    restart: unless-stopped
+```
+
+> 设为无限制时把对应值设为极大数，例如 `-e LIMIT_SPEED=100000`。
+
 **运行时修改（连接控制台）：**
 
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