fix: exclude recaptcha_token from Contact model in CRUD ...

- Updated create_contact to use model_dump(exclude={'recaptcha_token'})
- Updated tests to include recaptcha_token in ContactCreate
- All 17 tests passing

feat: pydantic schemas and CRUD operations with tests ...

- Added ContactCreate and ContactResponse schemas
- Implemented create_contact CRUD function
- Updated config to use lazy Settings loading
- Fixed Pydantic V2 validator syntax (field_validator)
- Added email-validator dependency
- All tests passing (5/5)