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

.claude/settings.local.json

@@ -0,0 +1,10 @@
+{
+  "permissions": {
+    "allow": [
+      "Bash(\".venv/Scripts/python.exe\" -m pytest tests/ -v --tb=short)",
+      "Bash(\".venv/Scripts/python.exe\" fix_databases.py)"
+    ],
+    "deny": [],
+    "ask": []
+  }
+}