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/AddColumn.php

@@ -0,0 +1,62 @@
+<?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\Column;
+use Phinx\Db\Table\Table;
+
+class AddColumn extends Action
+{
+    /**
+     * The column to add
+     *
+     * @var \Phinx\Db\Table\Column
+     */
+    protected $column;
+
+    /**
+     * Constructor
+     *
+     * @param \Phinx\Db\Table\Table $table The table to add the column to
+     * @param \Phinx\Db\Table\Column $column The column to add
+     */
+    public function __construct(Table $table, Column $column)
+    {
+        parent::__construct($table);
+        $this->column = $column;
+    }
+
+    /**
+     * Returns a new AddColumn object after assembling the given commands
+     *
+     * @param \Phinx\Db\Table\Table $table The table to add the column to
+     * @param string $columnName The column name
+     * @param string|\Phinx\Util\Literal $type The column type
+     * @param array<string, mixed> $options The column options
+     * @return static
+     */
+    public static function build(Table $table, string $columnName, $type = null, array $options = [])
+    {
+        $column = new Column();
+        $column->setName($columnName);
+        $column->setType($type);
+        $column->setOptions($options); // map options to column methods
+
+        return new static($table, $column);
+    }
+
+    /**
+     * Returns the column to be added
+     *
+     * @return \Phinx\Db\Table\Column
+     */
+    public function getColumn(): Column
+    {
+        return $this->column;
+    }
+}