fix: resolve CI linting failures

- Only lint errorfix/ directory, not tests/ from all projects
- Add mypy type checking step for comprehensive validation

.gitea/workflows/errorfix-ci.yml

@@ -39,5 +39,6 @@ jobs:
 
       - name: Run linting
         run: |
-          pip install ruff
-          ruff check errorfix/ tests/
+          pip install ruff mypy
+          ruff check errorfix/
+          python -m mypy errorfix/ --ignore-missing-imports