针对日志并发问题，在自动存点中增加Redis分布式冷却锁，杜绝进程重复触发导致经验暴涨，完善单元测试

tests/Feature/AutoSaveExpCommandTest.php

@@ -155,4 +155,36 @@ class AutoSaveExpCommandTest extends TestCase
         $user->refresh();
         $this->assertEquals(15, $user->exp_num);
     }
+
+    /**
+     * 测试自动存点命令会通过 Redis 冷却锁，防止在短时间内并发重复调度执行。
+     */
+    public function test_auto_save_cooldown_prevents_overlapping_process(): void
+    {
+        Sysparam::updateOrCreate(['alias' => 'exp_per_heartbeat'], ['body' => '5']);
+        Cache::flush();
+
+        $room = Room::create(['room_name' => 'cd']);
+        $user = User::factory()->create([
+            'username' => 'cooldown-user',
+            'exp_num' => 10,
+        ]);
+
+        Redis::hset("room:{$room->id}:users", $user->username, json_encode(['username' => $user->username], JSON_UNESCAPED_UNICODE));
+        Redis::setex("room:{$room->id}:alive:{$user->username}", 90, 1);
+
+        // 第一次执行自动存点
+        $this->artisan('chatroom:auto-save-exp')->assertSuccessful();
+
+        // 验证第一次加了经验 (10 + 5 = 15)
+        $user->refresh();
+        $this->assertEquals(15, $user->exp_num);
+
+        // 紧接着在冷却时间内（200秒内）模拟第二次并发执行
+        $this->artisan('chatroom:auto-save-exp')->assertSuccessful();
+
+        // 验证因为有 Redis 冷却锁，第二次执行被拦截，经验仍为 15，并未再次增加
+        $user->refresh();
+        $this->assertEquals(15, $user->exp_num);
+    }
 }