feat(media): media download command using yt-dlp

Introduced a new 'media' command group with a 'download' subcommand for downloading videos via yt-dlp. Updated help and README to include the new media category and command. Added yt-dlp to requirements.txt.

cogs/media/__init__.py

@@ -0,0 +1,57 @@
+import discord
+from discord.ext import commands
+from discord.ext.commands import Context
+
+from .download import download_command
+
+
+def _require_group_prefix(context: Context) -> bool:
+    if getattr(context, "interaction", None):
+        return True
+    group = getattr(getattr(context, "cog", None), "qualified_name", "").lower()
+    if not group:
+        return True
+    prefix = context.prefix or ""
+    content = context.message.content.strip().lower()
+    return content.startswith(f"{prefix}{group} ")
+
+class Media(commands.GroupCog, name="media"):
+    def __init__(self, bot) -> None:
+        self.bot = bot
+        super().__init__()
+
+    @commands.group(name="media", invoke_without_command=True)
+    async def media_group(self, context: Context):
+        embed = discord.Embed(
+            title="Media Commands",
+            description="Use `.media <subcommand>` or `/media <subcommand>`.",
+            color=0x7289DA
+        )
+        embed.set_author(name="Media", icon_url="https://yes.nighty.works/raw/y5SEZ9.webp")
+        embed.add_field(name="Available", value="download", inline=False)
+        await context.send(embed=embed)
+
+    async def _invoke_hybrid(self, context: Context, name: str):
+        command = self.bot.get_command(name)
+        if command is not None:
+            await context.invoke(command)
+        else:
+            await context.send(f"Unknown media command: {name}")
+
+    @media_group.command(name="download")
+    async def media_group_download(self, context: Context, *, url: str):
+        await self._invoke_hybrid(context, "download", url=url)
+
+    @commands.check(_require_group_prefix)
+    @commands.hybrid_command(
+        name="download",
+        description="Download a video from a URL using yt-dlp.",
+    )
+    async def download(self, context, *, url: str):
+        return await download_command()(self, context, url=url)
+
+async def setup(bot) -> None:
+    cog = Media(bot)
+    await bot.add_cog(cog)
+    
+    bot.logger.info("Loaded extension 'media.download'")