增强：聊天室内修改绑定邮箱时强制要求邮件验证码校验，并增加 60 秒发送频率限制防滥发机制

routes/web.php

@@ -49,6 +49,7 @@ Route::middleware(['chat.auth'])->group(function () {
     // ---- 第七阶段：用户资料与特权管理 ----
     Route::get('/user/{username}', [UserController::class, 'show'])->name('user.show');
     Route::put('/user/profile', [UserController::class, 'updateProfile'])->name('user.update_profile');
+    Route::post('/user/send-email-code', [\App\Http\Controllers\Api\VerificationController::class, 'sendEmailCode'])->name('user.send_email_code');
     Route::put('/user/password', [UserController::class, 'changePassword'])->name('user.update_password');
     Route::post('/user/{username}/kick', [UserController::class, 'kick'])->name('user.kick');
     Route::post('/user/{username}/mute', [UserController::class, 'mute'])->name('user.mute');