Disable ytdlp download in saved messages

[Copilot]

The ytdlp download feature was triggering when URLs were sent to saved messages (messages to self), creating unwanted downloads.

Changes

• Early exit for saved messages: Compare message.chat.id with bot's user ID and return before processing
• User ID caching: Lazily fetch and cache bot user ID to avoid repeated get_me() calls
• Applies to both triggers: Automatic URL detection and .dl command both skip saved messages

@UserBot.on_message(filters.regex(video_url_regex) & filters.me)
async def video_downloader(bot: UserBot, message: Message, from_reply=False):
    global _bot_user_id
    
    # Don't download if the message is sent to saved messages (to myself)
    if _bot_user_id is None:
        me = await bot.get_me()
        _bot_user_id = me.id
    
    if message.chat.id == _bot_user_id:
        return
    
    # ... rest of download logic

Original prompt

make it so that the ytdlp download feature does not work when I send a matching URL to saved messages, aka to myself.

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