feat: add Discord bot integration

- Discord bot runs in background thread alongside desktop app
- State synchronization between Discord and desktop waifu
- Commands: !hello, !status
- Responds to mentions and DMs
- Complete setup guide in DISCORD_SETUP.md
- Graceful fallback if no token configured

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

CLAUDE.md

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+
+  Todos
+
+  ☒ Research VRM rendering libraries for Python
+
+  ☒ Set up project structure and dependencies
+
+  ☒ Create transparent window with draggable functionality
+
+  ☒ Test basic functionality and fix OpenGL issues
+
+  ☒ Initialize git repository and commit
+
+  ☒ Implement VRM model loading and rendering
+
+  ☐ Add sound effects on interaction
+
+  ☐ Create basic chat interface
+
+  ☐ Integrate local LLM backend
+
+  ☐ Implement expression changes based on LLM state
+
+  ☐ Create Discord bot and integrate with desktop app
+