feat: never-expire Telegram session + logout confirmation on both channels

- STATE_TTL: 7200s → 315360000s (10 years) so sessions survive indefinitely
- Telegram: "salir"/"/salir" now shows inline confirmation keyboard instead of going straight to menu; "Cerrar sesión" button added to main menu; logout_ask/logout_confirm/confirmLogout() handler clears state and returns to email prompt
- Web chat: "Cerrar sesión" button in main menu; clicking it shows a confirmation message with "Sí, cerrar sesión" / "No, quedarme" buttons; only the confirmed action calls cerrarSesion()

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Services/TelegramBotService.php

@@ -31,7 +31,7 @@ use Illuminate\Support\Str;
 
 class TelegramBotService
 {
-    private const STATE_TTL = 7200; // 2 hours
+    private const STATE_TTL = 315360000; // 10 years — session never expires automatically
 
     private ?int $convId = null;
 
@@ -63,10 +63,20 @@ class TelegramBotService
 
         $lower = strtolower(trim($text));
 
+        // "salir" siempre pide confirmación de cierre de sesión
+        if (in_array($lower, ['salir', '/salir'])) {
+            if ($state['user_id'] ?? null) {
+                $this->showLogoutConfirmation($chatId);
+            } else {
+                $this->askEmail($chatId);
+            }
+            return;
+        }
+
         // Palabras que siempre regresan al menú, desde cualquier punto del flujo
         $menuTriggers = [
-            '/start', '/menu', '/salir', '/inicio', '/cancelar',
-            'menu', 'menú', 'inicio', 'hola', 'salir', 'volver',
+            '/start', '/menu', '/inicio', '/cancelar',
+            'menu', 'menú', 'inicio', 'hola', 'volver',
             'regresar', 'cancelar', 'empezar', 'comenzar', 'start',
         ];
 
@@ -118,7 +128,9 @@ class TelegramBotService
         $action = $parts[0];
 
         match ($action) {
-            'menu'        => $this->showMainMenu($chatId),
+            'menu'           => $this->showMainMenu($chatId),
+            'logout_ask'     => $this->showLogoutConfirmation($chatId),
+            'logout_confirm' => $this->confirmLogout($chatId),
             'svc_list'    => $this->listServices($chatId),
             'svc_view'    => $this->viewService($chatId, (int) ($parts[1] ?? 0)),
             'buy_start'   => $this->startPurchase($chatId, (int) ($parts[1] ?? 0)),
@@ -497,6 +509,30 @@ class TelegramBotService
 
     // ─── Main menu ────────────────────────────────────────────
 
+    private function showLogoutConfirmation(string $chatId): void
+    {
+        $this->sendWithKeyboard(
+            $chatId,
+            "⚠️ ¿Deseas cerrar sesión?\nDeberás volver a ingresar tu correo y código para continuar.",
+            [
+                [
+                    ['text' => '✅ Sí, cerrar sesión', 'callback_data' => 'logout_confirm'],
+                    ['text' => '❌ No, quedarme',      'callback_data' => 'menu'],
+                ],
+            ]
+        );
+    }
+
+    private function confirmLogout(string $chatId): void
+    {
+        $state = $this->getState($chatId);
+        unset($state['user_id'], $state['conv_id'], $state['step'], $state['data']);
+        $state['step'] = 'await_email';
+        $this->setState($chatId, $state);
+        $this->send($chatId, "👋 Sesión cerrada. Hasta pronto.");
+        $this->askEmail($chatId);
+    }
+
     private function showMainMenu(string $chatId): void
     {
         $state         = $this->getState($chatId);
@@ -520,6 +556,9 @@ class TelegramBotService
             [
                 ['text' => '🧑 Hablar con asesor', 'callback_data' => 'agent'],
             ],
+            [
+                ['text' => '🚪 Cerrar sesión',     'callback_data' => 'logout_ask'],
+            ],
         ]);
     }