- Rename CRUD layer to Repository layer throughout architecture documentation.
- Update dependency injection examples to use repository classes.
- Add async SQLAlchemy pattern for Repository methods (`select()` and transactions).
- Replace CRUD references in FEATURE_EXAMPLE.md with Repository-focused implementation details.
- Highlight repository class responsibilities and remove outdated CRUD patterns.
- Updated `CODING_STANDARDS.md` with async SQLAlchemy patterns, modern Python type hints, and new error handling examples.
- Introduced a new `COMMON_PITFALLS.md` file detailing frequent implementation mistakes and explicit rules to prevent them.
- Covered database optimizations, validation best practices, FastAPI design guidelines, security considerations, and Python language issues.
- Aimed to enhance code quality and reduce recurring mistakes during development.
