Implement Rock Paper Scissors command for Discord bot

[Copilot]

Adds a new /rps slash command that allows users to challenge each other to Rock Paper Scissors games, similar to the existing /duel command.

Features

• Interactive Challenge System: /rps @user creates a challenge with Rock 🪨, Paper 📄, and Scissors ✂️ buttons
• Real-time Status Updates: Embed updates to show when players make their choices
• Choice Flexibility: Players can change their selection until both have decided
• Complete Results Display: Shows both players' choices with emojis and declares the winner
• Automatic Timeout: Games expire after 5 minutes with proper cleanup
• Validation: Prevents self-challenges, bot challenges, and duplicate games between users

Implementation Details

The implementation follows the existing duel command pattern in UserSlashModule.cs:

• Uses ConcurrentDictionary for thread-safe game state management
• Implements proper Discord interaction patterns with button components
• Includes comprehensive error handling and validation
• Maintains consistency with existing bot architecture

Game Flow

1. User runs /rps @opponent to create a challenge
2. Interactive embed displays with three choice buttons
3. Both players can click buttons to make/change their choices
4. Embed updates to show when someone has decided
5. Once both choose, results are displayed with winner determination
6. Games automatically expire after 5 minutes if incomplete

Code Quality

• 264 lines added, 0 deleted - Pure addition with no breaking changes
• All existing functionality preserved
• Follows established patterns and coding conventions
• Comprehensive input validation and error handling

Fixes #337.

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[deepsource-io]

Here's the code health analysis summary for commits cff4d0d..b6e5976. View details on DeepSource ↗.

Analysis Summary

Analyzer	Status	Summary	Link
C#	❌ Failure	❗ 2 occurences introduced	View Check ↗

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[Pierre-Demessence]

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[Copilot]

Pull Request Overview

Implements a new /rps slash command that allows Discord users to challenge each other to interactive Rock Paper Scissors games with real-time status updates and automatic timeout handling.

• Adds complete Rock Paper Scissors game system with challenge creation, choice handling, and result determination
• Implements thread-safe game state management using ConcurrentDictionary and Discord button interactions
• Includes comprehensive validation, error handling, and automatic 5-minute game expiration