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/Db/Action/AddIndex.php

@@ -0,0 +1,67 @@
+<?php
+
+/**
+ * MIT License
+ * For full license information, please view the LICENSE file that was distributed with this source code.
+ */
+
+namespace Phinx\Db\Action;
+
+use Phinx\Db\Table\Index;
+use Phinx\Db\Table\Table;
+
+class AddIndex extends Action
+{
+    /**
+     * The index to add to the table
+     *
+     * @var \Phinx\Db\Table\Index
+     */
+    protected $index;
+
+    /**
+     * Constructor
+     *
+     * @param \Phinx\Db\Table\Table $table The table to add the index to
+     * @param \Phinx\Db\Table\Index $index The index to be added
+     */
+    public function __construct(Table $table, Index $index)
+    {
+        parent::__construct($table);
+        $this->index = $index;
+    }
+
+    /**
+     * Creates a new AddIndex object after building the index object with the
+     * provided arguments
+     *
+     * @param \Phinx\Db\Table\Table $table The table to add the index to
+     * @param string|string[]|\Phinx\Db\Table\Index $columns The columns to index
+     * @param array<string, mixed> $options Additional options for the index creation
+     * @return static
+     */
+    public static function build(Table $table, $columns, array $options = [])
+    {
+        // create a new index object if strings or an array of strings were supplied
+        $index = $columns;
+
+        if (!$columns instanceof Index) {
+            $index = new Index();
+
+            $index->setColumns($columns);
+            $index->setOptions($options);
+        }
+
+        return new static($table, $index);
+    }
+
+    /**
+     * Returns the index to be added
+     *
+     * @return \Phinx\Db\Table\Index
+     */
+    public function getIndex(): Index
+    {
+        return $this->index;
+    }
+}