Add bot commands setup, inline keyboards, and project dependencies

bot/handlers/user.py

@@ -0,0 +1,56 @@
+from aiogram import F, Router
+from aiogram.filters import Command, CommandStart
+from aiogram.types import CallbackQuery, Message
+
+from bot.keyboards.inline import get_links_keyboard
+from bot.keyboards.reply import get_main_menu_keyboard
+
+router = Router()
+
+
+@router.message(CommandStart())
+async def cmd_start(message: Message):
+    """
+    Handles /start command. Greets user and sends the main reply menu.
+    """
+    await message.answer(
+        f"Hello, {message.from_user.full_name}! Welcome to Frankenstein Bot.\n"
+        f"This bot is bootstrapped with a modular and clean structure.",
+        reply_markup=get_main_menu_keyboard(),
+    )
+
+
+@router.message(Command("help"))
+@router.message(F.text == "Help ❓")
+async def cmd_help(message: Message):
+    """
+    Handles /help command or 'Help ❓' reply keyboard button click.
+    """
+    await message.answer(
+        "Here is what I can do:\n"
+        "/start - Start the bot\n"
+        "/help - Get help information\n"
+        "/about - Learn more about the bot",
+        reply_markup=get_links_keyboard(),
+    )
+
+
+@router.message(Command("about"))
+@router.message(F.text == "About ℹ️")
+async def cmd_about(message: Message):
+    """
+    Handles /about command or 'About ℹ️' reply keyboard button click.
+    """
+    await message.answer(
+        "Frankenstein Bot is a high-performance Python Telegram bot built on aiogram v3, "
+        "designed to work seamlessly with systemd process management."
+    )
+
+
+@router.callback_query(F.data == "support_contact")
+async def process_support_callback(callback: CallbackQuery):
+    """
+    Processes the inline keyboard callback query 'support_contact'.
+    """
+    await callback.message.answer("Support: Open an issue or contact our administrator.")
+    await callback.answer()