refactor(harness): freeze single-agent contracts

scripts/query_mysql.py

@@ -22,13 +22,20 @@ except ImportError:
     print("缺少依赖，请先执行: pip install pymysql")
     sys.exit(1)
 
-# 从 application.yml 读取的连接信息
+def required_env(name: str) -> str:
+    value = os.getenv(name)
+    if value is None or not value.strip():
+        print(f"缺少必需环境变量: {name}")
+        sys.exit(2)
+    return value.strip()
+
+
 DB_CONFIG = {
-    "host": "119.29.78.52",
-    "port": 33306,
-    "user": "root",
-    "password": "!Fucker123..",
-    "database": "superbiz_agent",
+    "host": os.getenv("SUPERBIZ_MYSQL_HOST", "119.29.78.52"),
+    "port": int(os.getenv("SUPERBIZ_MYSQL_PORT", "33306")),
+    "user": os.getenv("SUPERBIZ_MYSQL_USERNAME", "root"),
+    "password": required_env("SUPERBIZ_MYSQL_PASSWORD"),
+    "database": os.getenv("SUPERBIZ_MYSQL_DATABASE", "superbiz_agent"),
     "charset": "utf8mb4",
     "cursorclass": pymysql.cursors.DictCursor,
 }