AI implementation for openai and claude.

backend/app/config.py

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+from typing import Optional
+
+from pydantic_settings import BaseSettings
+
+
+class Settings(BaseSettings):
+    # API Keys
+    ANTHROPIC_API_KEY: Optional[str] = None
+    OPENAI_API_KEY: Optional[str] = None
+
+    # Provider Settings
+    DEFAULT_PROVIDER: str = "claude"
+    CLAUDE_MODEL: str = "claude-3-5-sonnet-20241022"
+    OPENAI_MODEL: str = "gpt-4-turbo-preview"
+
+    # API Settings
+    MAX_TOKENS: int = 4000
+    TEMPERATURE: float = 0.7
+    TIMEOUT: int = 60
+
+    # CORS
+    FRONTEND_URL: str = "http://localhost:3000"
+
+    # Rate Limiting
+    RATE_LIMIT_REQUESTS: int = 10
+    RATE_LIMIT_WINDOW: int = 60
+
+    class Config:
+        env_file = ".env"
+        case_sensitive = True
+
+
+settings = Settings()