main: 用户管理和会话功能初始实现

- 添加用户管理功能的测试，包括创建、更新、停用、激活用户及用户登录 JWT 测试
- 提供用户管理相关的请求验证类与控制器
- 引入 CORS 配置信息，支持跨域请求
- 添加数据库播种器以便创建根用户
- 配置 API 默认使用 JWT 认证
- 添加聊天会话和消息的模型、迁移文件及关联功能

app/Http/Resources/MessageResource.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/** @mixin \App\Models\Message */
+class MessageResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'message_id' => $this->message_id,
+            'session_id' => $this->session_id,
+            'seq' => $this->seq,
+            'role' => $this->role,
+            'type' => $this->type,
+            'content' => $this->content,
+            'payload' => $this->payload,
+            'reply_to' => $this->reply_to,
+            'dedupe_key' => $this->dedupe_key,
+            'created_at' => $this->created_at,
+        ];
+    }
+}

app/Http/Resources/UserResource.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace App\Http\Resources;
+
+use Illuminate\Http\Request;
+use Illuminate\Http\Resources\Json\JsonResource;
+
+/** @mixin \App\Models\User */
+class UserResource extends JsonResource
+{
+    /**
+     * Transform the resource into an array.
+     *
+     * @return array<string, mixed>
+     */
+    public function toArray(Request $request): array
+    {
+        return [
+            'id' => $this->id,
+            'name' => $this->name,
+            'email' => $this->email,
+            'is_active' => $this->is_active,
+            'created_at' => $this->created_at,
+            'updated_at' => $this->updated_at,
+        ];
+    }
+}