feat: 重构数据中枢工作台与接入管理

- 新增统一的数据源、目录、纳管表与 Excel 处理后端能力

- 重建管理端数据中枢工作台并替换旧表管理页面

- 补充数据中枢迁移脚本、连接器底座与说明字段支持

easyflow-modules/easyflow-module-datacenter/src/main/java/tech/easyflow/datacenter/security/DatacenterCredentialCipher.java

@@ -0,0 +1,28 @@
+package tech.easyflow.datacenter.security;
+
+import cn.hutool.crypto.SecureUtil;
+import cn.hutool.crypto.symmetric.AES;
+import org.springframework.stereotype.Component;
+
+import java.nio.charset.StandardCharsets;
+
+@Component
+public class DatacenterCredentialCipher {
+
+    private static final String DEFAULT_KEY = "easyflow-datacenter-phase1-key";
+    private final AES aes = SecureUtil.aes(SecureUtil.sha256(DEFAULT_KEY).substring(0, 16).getBytes(StandardCharsets.UTF_8));
+
+    public String encrypt(String plainText) {
+        if (plainText == null || plainText.isBlank()) {
+            return null;
+        }
+        return aes.encryptHex(plainText);
+    }
+
+    public String decrypt(String cipherText) {
+        if (cipherText == null || cipherText.isBlank()) {
+            return null;
+        }
+        return aes.decryptStr(cipherText);
+    }
+}