支持 Ubuntu 一键部署与 PM2，并增加系统设置改密。

默认账号改为 admin/admin123，去掉 Windows 部署说明，与客户端同套部署流程。

Co-authored-by: Cursor <cursoragent@cursor.com>

ecosystem.config.cjs

@@ -1,13 +1,28 @@
+/**
+ * PM2 进程定义(Ubuntu / Linux).
+ *
+ * 使用前:项目根存在 `.venv`,且已 pip install -r requirements.txt
+ *
+ *   pm2 start ecosystem.config.cjs
+ *   pm2 save && pm2 startup
+ */
+const path = require("path");
+
+const ROOT = __dirname;
+const PY = path.join(ROOT, ".venv", "bin", "python");
+
 module.exports = {
   apps: [
     {
       name: "crypto_okx_hub",
-      script: "app.py",
-      interpreter: "python3",
-      cwd: __dirname,
-      env: {
-        PYTHONUNBUFFERED: "1",
-      },
+      cwd: ROOT,
+      script: path.join(ROOT, "app.py"),
+      interpreter: PY,
+      instances: 1,
+      autorestart: true,
+      watch: false,
+      max_memory_restart: "400M",
+      env: { PYTHONPATH: ROOT },
     },
   ],
 };