fix: 部门列表空/职务无法启用 — fetchTree适配树形API响应, positions表加status/code/description字段

backend/database/migrations/2026_03_14_000005_add_status_code_to_positions_table.php

@@ -0,0 +1,24 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('positions', function (Blueprint $table) {
+            $table->string('code', 50)->nullable()->after('name')->comment('职务编码');
+            $table->tinyInteger('status')->default(1)->after('sort')->comment('1启用 0停用');
+            $table->string('description', 255)->nullable()->after('status')->comment('备注');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('positions', function (Blueprint $table) {
+            $table->dropColumn(['code', 'status', 'description']);
+        });
+    }
+};