feat: Add database setup guide and local configuration files

- Added DATABASE_SETUP.md with comprehensive guide for PostgreSQL and Redis installation on Windows
- Created .claude/settings.local.json with permission settings for pytest and database fix scripts
- Updated .gitignore to exclude .env.backup file
- Included database connection test utilities in lyra/database_setup.py
- Added environment variable configuration examples for local development

lyra/emotions/__init__.py

@@ -7,12 +7,10 @@ express, and remember emotions like a real person.
 
 from .system import EmotionalSystem, EmotionalState, EmotionMemory
 from .expressions import EmotionalExpressionEngine
-from .responses import EmotionalResponseGenerator
 
 __all__ = [
     "EmotionalSystem",
     "EmotionalState",
     "EmotionMemory",
-    "EmotionalExpressionEngine",
-    "EmotionalResponseGenerator"
+    "EmotionalExpressionEngine"
 ]