feat: Add Player2 local app auto-detection with manual API key fallback

[CarlosNahuelcoy]

Overview

This PR enhances the Player2 integration by adding automatic detection of the Player2 desktop application, providing users with two convenient options for Player2 authentication:

1. 🎯 Automatic (Recommended): Zero-config experience via local Player2 app
2. 🔑 Manual: Traditional API key method via web tool

Changes Made

Core Implementation

• Player2Client.cs: Added CreateAsync() factory method with local app detection
• ApiConfig.cs: Modified IsValid() to allow Player2 without manual API key
• Settings.cs: Added immediate status feedback when Player2 is selected
• AIClientFactory.cs: Updated to use new async Player2 client creation

User Experience Improvements

• Immediate feedback: Users get instant notification about Player2 app status
• Clear messaging: Distinct notifications for successful detection vs. setup needed
• Graceful fallback: Seamlessly falls back to manual API key if app unavailable
• Zero-config option: When Player2 app is running, no manual setup required

Player2 Integration Options

Option 1: Automatic Detection (Zero-Config) ⭐

• Download Player2 app: https://player2.game/
• Install and login to Player2 desktop application
• Select Player2 in RimTalk → Automatic detection and connection
• No API key needed - everything works automatically

Option 2: Manual API Key

• Generate API key: https://gerikuylerk.com/RimTalk/
• Copy key to RimTalk settings
• Works without Player2 app installed

Technical Details

• Local detection: Health check to localhost:4315 with 2-second timeout
• Authentication: Uses Player2's web login endpoint for local app integration
• Health checks: Optimized to only run for remote connections
• Game Client ID: Maintains existing 019a8368-b00b-72bc-b367-2825079dc6fb
• Backward compatibility: Existing Player2 setups continue working unchanged

Benefits

✅ Better UX: Automatic setup reduces friction for new users
✅ Reduced support: Fewer API key related questions and issues
✅ Modern approach: Leverages Player2's intended local app experience
✅ Flexible: Maintains manual option for users who prefer it
✅ Professional: Clear status feedback and error handling

Testing

• Local Player2 app detection works correctly
• Fallback to manual API key functions properly
• Settings show immediate status feedback
• Backward compatibility maintained
• Error handling for various scenarios
• Health checks work for both local and remote connections

Screenshots/Demo

Users will see:

• ✅ "Player2 desktop app detected and ready for use!" (when app running)
• ⚠️ "Player2 desktop app not detected. Install Player2 app or add API key manually." (when app not available)

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Note: This enhancement makes Player2 significantly more user-friendly while maintaining full backward compatibility. Users can choose the method that works best for their setup.

[jlibrary]

LGTM 👍 Merging.