cleanup: remove dead maintenance mode artifacts in bot.py (#104)

Closes #104

- Remove duplicate `self.maintenance_mode: bool = False` assignment (merge
  artifact from PR #83)
- Delete dead `@self.tree.interaction_check` block in `setup_hook` that
  generated a RuntimeWarning at startup; `MaintenanceAwareTree.interaction_check()`
  already handles this correctly via the `tree_cls=MaintenanceAwareTree` kwarg

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

bot.py

@@ -42,7 +42,9 @@ def setup_logging():
 
     # JSON file handler - structured logging for monitoring and analysis
     json_handler = RotatingFileHandler(
-        "logs/discord_bot_v2.json", maxBytes=5 * 1024 * 1024, backupCount=5  # 5MB
+        "logs/discord_bot_v2.json",
+        maxBytes=5 * 1024 * 1024,
+        backupCount=5,  # 5MB
     )
     json_handler.setFormatter(JSONFormatter())
     logger.addHandler(json_handler)
@@ -120,28 +122,11 @@ class SBABot(commands.Bot):
 
         self.maintenance_mode: bool = False
         self.logger = logging.getLogger("discord_bot_v2")
-        self.maintenance_mode: bool = False
 
     async def setup_hook(self):
         """Called when the bot is starting up."""
         self.logger.info("Setting up bot...")
 
-        @self.tree.interaction_check
-        async def maintenance_check(interaction: discord.Interaction) -> bool:
-            """Block non-admin users when maintenance mode is enabled."""
-            if not self.maintenance_mode:
-                return True
-            if (
-                isinstance(interaction.user, discord.Member)
-                and interaction.user.guild_permissions.administrator
-            ):
-                return True
-            await interaction.response.send_message(
-                "🔧 The bot is currently in maintenance mode. Please try again later.",
-                ephemeral=True,
-            )
-            return False
-
         # Load command packages
         await self._load_command_packages()
 
@@ -443,7 +428,9 @@ async def health_command(interaction: discord.Interaction):
         embed.add_field(name="Bot Status", value="✅ Online", inline=True)
         embed.add_field(name="API Status", value=api_status, inline=True)
         embed.add_field(name="Guilds", value=str(guild_count), inline=True)
-        embed.add_field(name="Latency", value=f"{bot.latency*1000:.1f}ms", inline=True)
+        embed.add_field(
+            name="Latency", value=f"{bot.latency * 1000:.1f}ms", inline=True
+        )
 
         if bot.user:
             embed.set_footer(