refactor: Pre-commit and Type Checking Improvements

[iamserda]

Add SQLModel dependency and refactor URL models

• Added sqlmodel dependency to pyproject.toml.
• Refactored URL request and response models by moving them to a new schemas.py file.
• Updated import statements in main.py to reflect the new model locations. --@iamserda
  This pull request updates the pre-commit and type checking configuration, adds a new dependency, and refactors model imports and file structure for better organization. The most significant changes are grouped below:

Pre-commit and Type Checking Improvements:

• Updated the mypy pre-commit hook in .pre-commit-config.yaml to use poetry run mypy with system language and project root as the target, improving consistency with the project's dependency management.
• Changed the Makefile so that the typecheck target runs mypy via pre-commit, and improved the precommit target to echo a success message instead of running pre-commit redundantly.
• Removed the ruff target from the Makefile to streamline linting commands.

Dependency Management:

• Added sqlmodel as a new dependency in pyproject.toml, preparing the project for SQL modeling.

Model Refactoring and File Structure:

• Renamed src/models/main.py to src/models/schemas.py, removed unused models (ShortiLink, ClickEvent), and updated imports in src/app/main.py to reflect this change, clarifying the distinction between schema and other model types. [1] [2]