style: unify code formatting and import order

- Remove trailing whitespace and normalize blank lines
- Unify string quotes and line breaks for long lines
- Sort imports alphabetically across modules

nanobot/config/schema.py

@@ -3,7 +3,7 @@
 from pathlib import Path
 from typing import Literal
 
-from pydantic import BaseModel, Field, ConfigDict
+from pydantic import BaseModel, ConfigDict, Field
 from pydantic.alias_generators import to_camel
 from pydantic_settings import BaseSettings