Add initial structure for YouTrack integration

This commit introduces new models for YouTrackActivityItem and YouTrackUser using Pydantic for data validation. It also adds related configuration files for project setup (.idea) and dependency management (poetry.lock). These changes lay the groundwork for building features around YouTrack integration.

.gitignore

@@ -1,12 +1,37 @@
-# Byte-compiled / optimized / DLL files
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+.idea/**/aws.xml
+.idea/**/contentModel.xml
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+.idea/**/gradle.xml
+.idea/**/libraries
+cmake-build-*/
+.idea/**/mongoSettings.xml
+*.iws
+out/
+.idea_modules/
+atlassian-ide-plugin.xml
+.idea/replstate.xml
+.idea/sonarlint/
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+.idea/httpRequests
+.idea/caches/build_file_checksums.ser
 __pycache__/
 *.py[cod]
 *$py.class
-
-# C extensions
 *.so
-
-# Distribution / packaging
 .Python
 build/
 develop-eggs/
@@ -25,18 +50,10 @@ share/python-wheels/
 .installed.cfg
 *.egg
 MANIFEST
-
-# PyInstaller
-#  Usually these files are written by a python script from a template
-#  before PyInstaller builds the exe, so as to inject date/other infos into it.
 *.manifest
 *.spec
-
-# Installer logs
 pip-log.txt
 pip-delete-this-directory.txt
-
-# Unit test / coverage reports
 htmlcov/
 .tox/
 .nox/
@@ -50,122 +67,42 @@ coverage.xml
 .hypothesis/
 .pytest_cache/
 cover/
-
-# Translations
 *.mo
 *.pot
-
-# Django stuff:
 *.log
 local_settings.py
 db.sqlite3
 db.sqlite3-journal
-
-# Flask stuff:
 instance/
 .webassets-cache
-
-# Scrapy stuff:
 .scrapy
-
-# Sphinx documentation
 docs/_build/
-
-# PyBuilder
 .pybuilder/
 target/
-
-# Jupyter Notebook
 .ipynb_checkpoints
-
-# IPython
 profile_default/
 ipython_config.py
-
-# pyenv
-#   For a library or package, you might want to ignore these files since the code is
-#   intended to run in multiple environments; otherwise, check them in:
-# .python-version
-
-# pipenv
-#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
-#   However, in case of collaboration, if having platform-specific dependencies or dependencies
-#   having no cross-platform support, pipenv may install dependencies that don't work, or not
-#   install all needed dependencies.
-#Pipfile.lock
-
-# UV
-#   Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#uv.lock
-
-# poetry
-#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
-#   This is especially recommended for binary packages to ensure reproducibility, and is more
-#   commonly ignored for libraries.
-#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
-#poetry.lock
-
-# pdm
-#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
-#pdm.lock
-#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
-#   in version control.
-#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
 .pdm.toml
 .pdm-python
 .pdm-build/
-
-# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
 __pypackages__/
-
-# Celery stuff
 celerybeat-schedule
 celerybeat.pid
-
-# SageMath parsed files
 *.sage.py
-
-# Environments
 .env
 .venv
 env/
 venv/
 ENV/
 env.bak/
 venv.bak/
-
-# Spyder project settings
 .spyderproject
 .spyproject
-
-# Rope project settings
 .ropeproject
-
-# mkdocs documentation
 /site
-
-# mypy
 .mypy_cache/
 .dmypy.json
 dmypy.json
-
-# Pyre type checker
 .pyre/
-
-# pytype static type analyzer
 .pytype/
-
-# Cython debug symbols
 cython_debug/
-
-# PyCharm
-#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
-#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
-#  and can be added to the global gitignore or merged into this file.  For a more nuclear
-#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
-#.idea/
-
-# PyPI configuration file
-.pypirc