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/knowledge/acquisition_manager.py

@@ -0,0 +1,14 @@
+"""
+Placeholder for Knowledge Acquisition Manager.
+Will be fully implemented in the next phase.
+"""
+
+class KnowledgeAcquisitionManager:
+    """Placeholder knowledge acquisition manager."""
+
+    def __init__(self):
+        pass
+
+    async def initialize(self):
+        """Initialize the knowledge acquisition system."""
+        pass