chore: Update gitignore files for all components

- Add comprehensive .gitignore for main repo
- Update swingmusic-desktop .gitignore for Rust/Node/Tauri
- Update swingmusic-android .gitignore for Android/Gradle builds
- Update swingmusic-webclient .gitignore for Node.js/Nuxt
- Add src/swingmusic/.gitignore for Python backend

Now ignoring:
🚫 Build artifacts (target/, build/, dist/, node_modules/)
🚫 Generated packages (*.apk, *.exe, *.dmg, *.deb, *.rpm)
🚫 IDE files (.idea/, .vscode/, *.swp)
🚫 OS files (.DS_Store, Thumbs.db)
🚫 Logs and temporary files
🚫 Cache directories
🚫 Environment and config files with secrets

Keeps repo clean while preserving source code only!

src/swingmusic/.gitignore

@@ -0,0 +1,169 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# 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
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+Pipfile.lock
+
+# PEP 582
+__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/
+
+# Flask specific
+instance/
+.webassets-cache
+
+# Database files
+*.db
+*.sqlite
+*.sqlite3
+
+# Static files and media
+static/
+media/
+uploads/
+
+# Logs
+*.log
+logs/
+
+# OS
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Editor
+.idea/
+.vscode/
+*.swp
+*.swo
+*~
+
+# Temporary files
+*.tmp
+*.temp
+
+# Cache
+.cache/
+
+# Local configuration
+config_local.py
+settings_local.py
+.secrets