修复(chat): 新增真实 IP 获取中间件及重构用户 IP 轨迹追踪逻辑

- 新增 CloudflareProxies 前置中间件，强制解析 CDN 透传的 CF-Connecting-IP 与 X-Real-IP 并在底层接管，修复 Nginx 代理造成的全局 IP 同化 (127.0.0.1) 问题
- 修改 User 模型，新增 migration 以补全真正的 previous_ip 储存通道
- 修改 AuthController 登录逻辑，在覆写 last_ip 前实现向 previous_ip 的自动历史快照备份
- 修改 UserController API 返回逻辑，实现 first_ip、last_ip（上次）以及 login_ip（本次）的三轨分离
- 更新 user-actions.blade.php 管理员视野面板，同步增加并校验“首次IP”、“上次IP”、“本次IP”三级字段映射的准确性

bootstrap/app.php

@@ -12,14 +12,17 @@ return Application::configure(basePath: dirname(__DIR__))
         health: '/up',
     )
     ->withMiddleware(function (Middleware $middleware) {
+        // 强制解析并信任 CDN (如 Cloudflare) 透传的真实 IP (最高优先级)
+        $middleware->prepend(\App\Http\Middleware\CloudflareProxies::class);
+
         // 信任所有代理转发头（腾讯 EdgeCDN HTTPS 回源 HTTP 场景）
         // CDN 携带 X-Forwarded-Proto: https，Laravel 据此将请求识别为 HTTPS，url()/route() 生成正确的 https:// 链接
         $middleware->trustProxies(at: '*');
 
         $middleware->alias([
-            'chat.auth'         => \App\Http\Middleware\ChatAuthenticate::class,
-            'chat.level'        => \App\Http\Middleware\LevelRequired::class,
-            'chat.site_owner'   => \App\Http\Middleware\SiteOwnerRequired::class,
+            'chat.auth' => \App\Http\Middleware\ChatAuthenticate::class,
+            'chat.level' => \App\Http\Middleware\LevelRequired::class,
+            'chat.site_owner' => \App\Http\Middleware\SiteOwnerRequired::class,
             'chat.has_position' => \App\Http\Middleware\HasActivePosition::class,
         ]);