refactor(oauth): Convert authentication commands to hybrid group

Migrate `auth`, `deauth`, and `authstatus` commands to subcommands of a new `auth` hybrid command group. This results in commands like `auth login`, `auth logout`, and `auth status`.

This change:
- Improves command organization and discoverability.
- Leverages Discord's built-in help system for command groups, making the custom `authhelp` command redundant.
- Prepares for seamless integration with slash commands by using `commands.hybrid_group`.

cogs/oauth_cog.py

@@ -153,8 +153,17 @@ class OAuthCog(commands.Cog):
         # Remove the pending auth entry
         self.pending_auth.pop(user_id, None)
 
-    @commands.command(name="auth")
-    async def auth_command(self, ctx):
+    @commands.hybrid_group(name="auth", description="Manage Discord authentication.")
+    async def auth(self, ctx: commands.Context):
+        """Manage Discord authentication."""
+        if ctx.invoked_subcommand is None:
+            await ctx.send_help(ctx.command)
+
+    @auth.command(
+        name="login",
+        description="Authenticate with Discord to allow the bot to access the API on your behalf.",
+    )
+    async def login(self, ctx: commands.Context):
         """Authenticate with Discord to allow the bot to access the API on your behalf."""
         user_id = str(ctx.author.id)
 
@@ -165,7 +174,7 @@ class OAuthCog(commands.Cog):
             is_valid, _ = await discord_oauth.validate_token(token)
             if is_valid:
                 await ctx.send(
-                    f"You are already authenticated. Use `!deauth` to revoke access or `!authstatus` to check your status."
+                    f"You are already authenticated. Use `{ctx.prefix}auth logout` to revoke access or `{ctx.prefix}auth status` to check your status."
                 )
                 return
 
@@ -241,8 +250,10 @@ class OAuthCog(commands.Cog):
                 f"This link will expire in 10 minutes."
             )
 
-    @commands.command(name="deauth")
-    async def deauth_command(self, ctx):
+    @auth.command(
+        name="logout", description="Revoke the bot's access to your Discord account."
+    )
+    async def logout(self, ctx: commands.Context):
         """Revoke the bot's access to your Discord account."""
         user_id = str(ctx.author.id)
 
@@ -275,8 +286,8 @@ class OAuthCog(commands.Cog):
         else:
             await ctx.send("❌ You are not currently authenticated.")
 
-    @commands.command(name="authstatus")
-    async def auth_status_command(self, ctx):
+    @auth.command(name="status", description="Check your authentication status.")
+    async def status(self, ctx: commands.Context):
         """Check your authentication status."""
         user_id = str(ctx.author.id)
 
@@ -367,38 +378,9 @@ class OAuthCog(commands.Cog):
 
         # If we get here, the user is not authenticated anywhere
         await ctx.send(
-            "❌ You are not currently authenticated. Use `!auth` to authenticate."
+            f"❌ You are not currently authenticated. Use `{ctx.prefix}auth login` to authenticate."
         )
 
-    @commands.command(name="authhelp")
-    async def auth_help_command(self, ctx):
-        """Get help with authentication commands."""
-        embed = discord.Embed(
-            title="Authentication Help",
-            description="Commands for managing Discord authentication",
-            color=discord.Color.blue(),
-        )
-
-        embed.add_field(
-            name="!auth",
-            value="Authenticate with Discord to allow the bot to access additional OAuth scopes",
-            inline=False,
-        )
-
-        embed.add_field(
-            name="!deauth",
-            value="Revoke the bot's access to your Discord account",
-            inline=False,
-        )
-
-        embed.add_field(
-            name="!authstatus", value="Check your authentication status", inline=False
-        )
-
-        embed.add_field(name="!authhelp", value="Show this help message", inline=False)
-
-        await ctx.send(embed=embed)
-
 
 async def setup(bot: commands.Bot):
     await bot.add_cog(OAuthCog(bot))