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/config.py

@@ -1,18 +1,19 @@
 import os
 from pathlib import Path
 from typing import Dict, Any
-from pydantic import BaseSettings, Field
+from pydantic import Field
+from pydantic_settings import BaseSettings
 from dotenv import load_dotenv
 
 load_dotenv()
 
 class LyraConfig(BaseSettings):
     # Discord Configuration
-    discord_token: str = Field(..., env="DISCORD_TOKEN")
-    discord_guild_id: int = Field(..., env="DISCORD_GUILD_ID")
+    discord_token: str = Field("", env="DISCORD_TOKEN")
+    discord_guild_id: int = Field(0, env="DISCORD_GUILD_ID")
 
     # Database Configuration
-    database_url: str = Field(..., env="DATABASE_URL")
+    database_url: str = Field("sqlite:///data/lyra.db", env="DATABASE_URL")
     redis_url: str = Field("redis://localhost:6379/0", env="REDIS_URL")
 
     # Model Configuration