Enhance logging system and update dependencies

- Updated `.gitignore` to exclude log files from version control.
- Added `pytest` as a dependency in `pyproject.toml` for testing purposes.
- Included `pytest` in `uv.lock` to ensure consistent dependency management.
- Introduced comprehensive documentation for the new unified logging system in `docs/logging.md`, detailing features, usage, and configuration options.

.gitignore

@@ -3,3 +3,7 @@
 .env.local
 .env.*
 database/migrations/versions/*
+
+# Exclude log files
+logs/
+*.log