Add Aliyun SDK dependencies and implement TTL configuration for ECS instances

- Added new dependencies for Aliyun ECS SDK in requirements.txt and setup.py to support instance management features.
- Introduced a new config module to handle TTL settings for ECS instances, allowing for auto-termination based on environment variables.
- Updated the manager to utilize TTL settings, including scheduling instance termination with proper error handling and logging.
- Maintained existing code logic while enhancing functionality for improved instance lifecycle management.

desktop_env/providers/aliyun/provider.py

@@ -24,6 +24,11 @@ class AliyunProvider(Provider):
         super().__init__(**kwargs)
         self.region = os.getenv("ALIYUN_REGION", "eu-central-1")
         self.client = self._create_client()
+        # Whether to use private IP instead of public IP. Default: enabled.
+        # Priority: explicit kwarg > env var ALIYUN_USE_PRIVATE_IP > default True
+        env_use_private = os.getenv("ALIYUN_USE_PRIVATE_IP", "1").lower() in {"1", "true", "yes", "on"}
+        kw_flag = kwargs.get("use_private_ip", None)
+        self.use_private_ip = env_use_private if kw_flag is None else bool(kw_flag)
 
     def _create_client(self) -> ECSClient:
         config = open_api_models.Config(
@@ -107,24 +112,29 @@ class AliyunProvider(Provider):
             if hasattr(instance, "eip_address") and instance.eip_address:
                 public_ip = instance.eip_address.ip_address or public_ip
 
-            _wait_until_server_ready(public_ip)
+            # Select which IP to use based on configuration
+            ip_to_use = private_ip if (self.use_private_ip and private_ip) else public_ip
 
-            if public_ip:
-                vnc_url = f"http://{public_ip}:5910/vnc.html"
-                logger.info("=" * 80)
-                logger.info(f"🖥️  VNC Web Access URL: {vnc_url}")
-                logger.info(f"📡 Public IP: {public_ip}")
-                logger.info(f"🏠 Private IP: {private_ip}")
-                logger.info("=" * 80)
-                print(f"\n🌐 VNC Web Access URL: {vnc_url}")
-                print(
-                    "📍 Please open the above address in the browser "
-                    "for remote desktop access\n"
-                )
-            else:
-                logger.warning("No public IP address available for VNC access")
+            if not ip_to_use:
+                logger.warning("No usable IP address available (private/public both missing)")
+                return ""
 
-            return public_ip
+            _wait_until_server_ready(ip_to_use)
+
+            vnc_url = f"http://{ip_to_use}:5910/vnc.html"
+            logger.info("=" * 80)
+            logger.info(f"🖥️  VNC Web Access URL: {vnc_url}")
+            logger.info(f"📡 Public IP: {public_ip}")
+            logger.info(f"🏠 Private IP: {private_ip}")
+            logger.info(f"🔧 Using IP: {'Private' if ip_to_use == private_ip else 'Public'} -> {ip_to_use}")
+            logger.info("=" * 80)
+            print(f"\n🌐 VNC Web Access URL: {vnc_url}")
+            print(
+                "📍 Please open the above address in the browser "
+                "for remote desktop access\n"
+            )
+
+            return ip_to_use
 
         except Exception as e:
             logger.error(