Implement complete Eugen Twitch chatbot

This commit implements the full Eugen bot based on specifications in CLAUDE.md and eugen_claude.md.

Features implemented:
- Smart name recognition (@Eugen, Eugen:, etc.)
- Persistent conversation memory per user (max 25 messages, 1 hour retention)
- Perplexity Sonar API integration for AI responses
- Live monitoring dashboard with PySimpleGUI
- Setup wizard for first-time configuration
- Comprehensive logging (main log + API debug log)

Files added:
- config.py: Configuration management from .env and config.json
- utils.py: MentionDetector and Logger utility classes
- memory.py: ConversationMemory for persistent chat history
- ai_provider.py: PerplexityProvider for API integration
- gui.py: Dashboard and SetupWizard GUI components
- chatbot.py: Main EugenBot orchestrator with IRC handling
- requirements.txt: Python dependencies
- .env.example: Template for environment variables
- .gitignore: Renamed from gitignore for proper Git usage

Updated:
- README.md: Complete usage instructions and documentation

The bot is ready to use - users just need to add their API keys and run python chatbot.py

requirements.txt

@@ -0,0 +1,5 @@
+irc==20.1.0
+python-dotenv==1.0.0
+PySimpleGUI==4.60.0
+requests==2.31.0
+httpx==0.25.0