fix(ai): issue #141 — custom OpenAI-compatible providers work + language selection on first start in sleep mode

- callOllama: reasoning_effort only for provider=ollama (others returned 400 -> stub reply)
- endpoint normalization: base URL (Groq /openai/v1) -> /chat/completions appended
- reasoning block stripping: <thinking>/<think> tags + thinking/response markers (Groq qwen)
- handleStart: sleep mode + language_set=0 -> show language selection keyboard first
- handleSetLanguage: sleep mode -> AI dialog in chosen language after selection

src/handlers/userHandlers/userHandler.js

@@ -128,7 +128,19 @@ ${t('profile.member_since')}: ${new Date(userStats.created_at).toLocaleDateStrin
 
             // Sleep mode: если магазин на паузе — живой ИИ-диалог вместо каталога
             if (await chatbotService.isSleepMode()) {
-                const lang = (await UserService.getUserByTelegramId(telegramId))?.language || 'en';
+                const user = await UserService.getUserByTelegramId(telegramId);
+                // Если язык ещё не выбран (первый старт) — сначала выбор языка
+                if (!user?.language_set) {
+                    const keyboard = {
+                        inline_keyboard: AVAILABLE_LANGUAGES.map(code => [{
+                            text: LANGUAGE_NAMES[code],
+                            callback_data: `set_language_${code}`
+                        }])
+                    };
+                    await bot.sendMessage(chatId, tForUser('en')('bot.language_select'), { reply_markup: keyboard });
+                    return;
+                }
+                const lang = user?.language || 'en';
                 // Приветствие от ИИ-бота (живой диалог, не заглушка)
                 const welcome = await chatbotService.sendToChatbot({
                     sessionId: telegramId,
@@ -176,6 +188,23 @@ ${t('profile.member_since')}: ${new Date(userStats.created_at).toLocaleDateStrin
 
             await bot.answerCallbackQuery(callbackQuery.id);
 
+            // Если магазин на паузе — после выбора языка сразу ИИ-диалог на выбранном языке
+            if (await chatbotService.isSleepMode()) {
+                try { await bot.deleteMessage(chatId, callbackQuery.message.message_id); } catch {}
+                const welcome = await chatbotService.sendToChatbot({
+                    sessionId: telegramId,
+                    message: '/start',
+                    telegramId,
+                    language: lang,
+                    username: callbackQuery.from?.username,
+                    name: callbackQuery.from?.first_name,
+                });
+                await bot.sendMessage(chatId, welcome.reply || await chatbotService.getWelcomeMessage(), {
+                    reply_markup: { remove_keyboard: true },
+                });
+                return;
+            }
+
             const keyboard = {
                 reply_markup: {
                     keyboard: [