chore: Update .gitignore to include additional runtime caches and output files

This commit enhances the .gitignore file by adding entries for runtime caches, TTS/audio outputs, and Python-related files. The changes ensure that unnecessary files are excluded from version control, improving repository cleanliness and reducing clutter.

Changes:
- Added entries for edge_tts_voices_cache.json, *.wav, and *.mp3 files.
- Included Python cache directories and virtual environment folders.
- Retained existing entries for build artifacts and IDE/editor files.

.gitignore

@@ -1,22 +1,34 @@
+# Secrets and user config
 .env
 .env_backup
-*.mp3
-build/
-dist/
+config/
 settings.json
 
-resampled_last_output.wav
-temp_speech_output.wav
-esampled_temp_speech_output.wav
-last_output.wav
-output.wav
-**output.wav
+# Runtime caches
+edge_tts_voices_cache.json
 
-.vs
-vs/
-.zip
+# TTS / audio outputs (project root only; assets/ is tracked)
+/*.wav
+/*.mp3
 
-config/
+# Python
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+*$py.class
+.venv/
+venv/
+env/
+.pytest_cache/
+.mypy_cache/
+*.egg-info/
 
-**/__pycache__/
-**__pycache__** 
+# Build artifacts
+build/
+dist/
+*.zip
+
+# IDE / editor
+.vs/
+.claude/