修复seeder错误；删除第三方的think迁移工具，在extend中重新实现；

extend/phinx/Config/FeatureFlags.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * MIT License
+ * For full license information, please view the LICENSE file that was distributed with this source code.
+ */
+
+namespace Phinx\Config;
+
+/**
+ * Class to hold features flags to toggle breaking changes in Phinx.
+ *
+ * New flags should be added very sparingly.
+ */
+class FeatureFlags
+{
+    /**
+     * @var bool Should Phinx create unsigned primary keys by default?
+     */
+    public static $unsignedPrimaryKeys = true;
+    /**
+     * @var bool Should Phinx create columns NULL by default?
+     */
+    public static $columnNullDefault = true;
+
+    /**
+     * Set the feature flags from the `feature_flags` section of the overall
+     * config.
+     *
+     * @param array $config The `feature_flags` section of the config
+     */
+    public static function setFlagsFromConfig(array $config): void
+    {
+        if (isset($config['unsigned_primary_keys'])) {
+            self::$unsignedPrimaryKeys = (bool)$config['unsigned_primary_keys'];
+        }
+        if (isset($config['column_null_default'])) {
+            self::$columnNullDefault = (bool)$config['column_null_default'];
+        }
+    }
+}