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!

.gitignore

@@ -1,4 +1,4 @@
-# local env files
+# Local environment files
 .env.local
 .env.*.local
 venv
@@ -13,31 +13,149 @@ venv
 *.sln
 *.sw?
 
-__pycache__
+# Python
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
 .hypothesis
-sqllib.py
-encoderx.py
-.pytest_cache
-
-# pyinstaller files
-dist
-build
-client
-.gitignore
+.pytest_cache/
+.coverage
+htmlcov/
 
+# Logs
+*.log
 logs.txt
-
-
-# TODO.md
-testdata.py
-test.py
 nohup.out
-*s.json
-
 
+# OS
 .DS_Store
-*.egg-info
-/wheels/
-client.zip
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Temporary files
+*.tmp
+*.temp
+*.swp
+*~
+
+# Build artifacts (should be in CI/CD only)
 *.whl
-.pypirc
+*.tar.gz
+*.zip
+*.apk
+*.exe
+*.dmg
+*.AppImage
+*.deb
+*.rpm
+*.msi
+*.pkg
+
+# Submodule build artifacts
+swingmusic-desktop/target/
+swingmusic-desktop/node_modules/
+swingmusic-desktop/dist/
+swingmusic-desktop/src-tauri/target/
+
+swingmusic-webclient/node_modules/
+swingmusic-webclient/dist/
+swingmusic-webclient/.nuxt/
+swingmusic-webclient/.output/
+swingmusic-webclient/.cache/
+
+swingmusic-android/app/build/
+swingmusic-android/.gradle/
+swingmusic-android/build/
+swingmusic-android/local.properties
+swingmusic-android/*.apk
+swingmusic-android/*.aab
+
+# Backend specific
+src/swingmusic/__pycache__/
+src/swingmusic/static/
+src/swingmusic/media/
+src/swingmusic/dist/
+src/swingmusic/build/
+src/swingmusic/*.egg-info/
+
+# Database
+*.db
+*.sqlite
+*.sqlite3
+
+# Configuration with secrets
+config.py
+settings_local.py
+.secrets
+.pypirc
+
+# Test files
+test.py
+testdata.py
+encoderx.py
+sqllib.py
+
+# Documentation build
+docs/_build/
+site/
+
+# Coverage reports
+coverage.xml
+*.cover
+.hypothesis/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# pipenv
+Pipfile.lock
+
+# PEP 582
+__pypackages__/
+
+# Celery
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Spyder
+.spyderproject
+.spyproject
+
+# Rope
+.ropeproject
+
+# mkdocs
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json