fix(05-01): simplify Show Menu to text-only help message

Native Telegram node replyKeyboard wasn't displaying. Fallback to
simple text message listing available commands. Can revisit persistent
keyboard feature later.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

n8n-workflow.json

@@ -2074,23 +2074,9 @@
         "resource": "message",
         "operation": "sendMessage",
         "chatId": "={{ $json.message.chat.id }}",
-        "text": "Use buttons below or type commands:",
+        "text": "Choose a command:\n\n• Status - view containers\n• Start/Stop/Restart <name>\n• Update <name>\n• Logs <name>",
         "additionalFields": {
-          "parse_mode": "HTML",
-          "replyMarkup": "replyKeyboard",
-          "replyKeyboard": {
-            "rows": [
-              { "row": { "buttons": [{ "text": "Status" }] } },
-              { "row": { "buttons": [{ "text": "Start" }, { "text": "Stop" }] } },
-              { "row": { "buttons": [{ "text": "Restart" }, { "text": "Update" }] } },
-              { "row": { "buttons": [{ "text": "Logs" }] } }
-            ]
-          },
-          "replyKeyboardOptions": {
-            "resize_keyboard": true,
-            "one_time_keyboard": false,
-            "is_persistent": true
-          }
+          "parse_mode": "HTML"
         }
       },
       "id": "telegram-show-menu",