✅ UserBot Integration Complete: Fixed container startup, integrated UserBot menu to main bot

MAJOR FIXES:
✅ Fixed UserBot container startup by making TELEGRAM_BOT_TOKEN optional
✅ Broke circular import chain between app modules
✅ Made Config.validate() conditional for UserBot-only mode
✅ Removed unused celery import from userbot_service.py

INTEGRATION:
✅ UserBot menu now accessible from main bot /start command
✅ Added 🤖 UserBot button to main keyboard
✅ Integrated userbot_manager.py handlers:
   - userbot_menu: Main UserBot interface
   - userbot_settings: Configuration
   - userbot_collect_groups: Gather all user groups
   - userbot_collect_members: Parse group members
✅ UserBot handlers properly registered in ConversationHandler

CONTAINERS:
✅ tg_autoposter_bot: Running and handling /start commands
✅ tg_autoposter_userbot: Running as standalone microservice
✅ All dependent services (Redis, PostgreSQL, Celery workers) operational

STATUS: Bot is fully operational and ready for testing

app/handlers/__init__.py

@@ -1,14 +1,20 @@
-from .commands import start, help_command
+from .commands import start, help_command, sync_groups_command
 from .callbacks import (
     start_callback, manage_messages, manage_groups,
     list_messages, list_groups
 )
 from .sender import send_message
 from .group_manager import my_chat_member
+from .userbot_manager import (
+    userbot_menu, userbot_settings, userbot_init,
+    userbot_collect_groups, userbot_collect_members,
+    userbot_parse_members, cancel_userbot
+)
 
 __all__ = [
     'start',
     'help_command',
+    'sync_groups_command',
     'start_callback',
     'manage_messages',
     'manage_groups',
@@ -16,4 +22,11 @@ __all__ = [
     'list_groups',
     'send_message',
     'my_chat_member',
+    'userbot_menu',
+    'userbot_settings',
+    'userbot_init',
+    'userbot_collect_groups',
+    'userbot_collect_members',
+    'userbot_parse_members',
+    'cancel_userbot',
 ]