main: 增强会话功能，支持消息管理和接口文档

- 添加 `last_message_id` 字段至 `chat_sessions` 表，更新其关联索引
- 实现会话更新接口，支持修改名称与状态并添加验证逻辑
- 增加会话列表接口，支持状态过滤与关键字查询
- 提供会话和消息相关的资源类和请求验证类
- 扩展 `ChatService` 服务层逻辑以处理会话更新和消息附加
- 编写测试用例以验证新功能的正确性
- 增加接口文档及 OpenAPI 规范文件，覆盖新增功能
- 更新数据库播种器，添加默认用户

database/migrations/2025_02_14_000004_add_last_message_to_chat_sessions.php

@@ -0,0 +1,28 @@
+<?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('chat_sessions', function (Blueprint $table) {
+            $table->uuid('last_message_id')->nullable()->after('last_seq');
+            $table->index('updated_at');
+            $table->index('status');
+            $table->index('last_message_id');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('chat_sessions', function (Blueprint $table) {
+            $table->dropIndex(['updated_at']);
+            $table->dropIndex(['status']);
+            $table->dropIndex(['last_message_id']);
+            $table->dropColumn('last_message_id');
+        });
+    }
+};

database/seeders/DatabaseSeeder.php

@@ -25,5 +25,15 @@ class DatabaseSeeder extends Seeder
                 'email_verified_at' => now(),
             ],
         );
+
+        User::updateOrCreate(
+            ['email' => 'guxinpei@qq.com'],
+            [
+                'name' => 'roog',
+                'password' => Hash::make('w2021976'),
+                'is_active' => true,
+                'email_verified_at' => now(),
+            ],
+        );
     }
 }