fix(docker): 修复DM8迁移脚本disql执行后挂起问题

migrate_on_server.py: SQL语句末尾补确保disql正常退出，避免迁移过程卡死
Co-Authored-By: Claude <noreply@anthropic.com>

AuxiliaryTool/ScriptTool/DM8-Docker/migrate_on_server.py

@@ -35,7 +35,8 @@ def mysql_query(db, query):
 
 
 def dm8_exec(sql):
-    encoded = base64.b64encode(sql.encode('utf-8')).decode('ascii')
+    sql_with_exit = sql + ';\nexit;'
+    encoded = base64.b64encode(sql_with_exit.encode('utf-8')).decode('ascii')
     cmd = ["docker", "exec", DM8_CONTAINER, "bash", "-c",
            f"echo -n {encoded} | base64 -d | /opt/dmdbms/bin/disql {DM8_USER}/{DM8_PASS}@localhost:{DM8_PORT} 2>&1 | grep -v 'login used\\|disql V8\\|SQL>\\|Server\\['"]
     try: