Enhancement: Add new brawler 'Sirius' to game configuration

[RemainingDelta]

Overview

This enhancement updates the game configuration to include the new Ultra Legendary brawler, "Sirius", making him available in the game.

Current Behavior

"Sirius" is missing from brawlers.json and EMOJIS_BRAWLERS, so he cannot be rolled or viewed within the bot.

Proposed Behavior

Sirius should be purchasable/rollable as an Ultra Legendary brawler with a custom emoji, fully integrated into the bot's brawler system.

Technical Requirements

• Update brawlers.json with Sirius info
• Update config.py: Add the emoji ID to EMOJIS_BRAWLERS dictionary (REAL and TEST)

Acceptance Criteria

• Sirius appears in the /brawlers list under Ultra Legendary.
• The emoji <:brawler_sirius:...> renders correctly in Discord.
• Users can upgrade Sirius (Power Points/Coins) correctly.

Benefit/Impact

Keeps the minigame roster up to date with the latest content, providing new gameplay options for users and reflecting current game data.

Branch

226-Enhancement