refactor: remove all inline comments from code

app/core/config.py

@@ -1,17 +1,12 @@
-"""Application configuration and settings."""
-
 from pydantic_settings import BaseSettings, SettingsConfigDict
 
 
 class Settings(BaseSettings):
-    """Application settings from environment variables."""
-
     app_name: str = "Blog API"
     debug: bool = False
     host: str = "0.0.0.0"
     port: int = 8000
 
-    # Database (when added)
     database_url: str | None = None
 
     model_config = SettingsConfigDict(env_file=".env")