Initial commit: Korean voice-cloning TTS prototype

FastAPI backend, web UI, CosyVoice3/F5-TTS setup scripts, and handoff docs for GPU PC continuation.

Co-authored-by: Cursor <cursoragent@cursor.com>

.gitignore

@@ -0,0 +1,16 @@
+.venvs/
+venv/
+__pycache__/
+*.py[cod]
+.env
+*.wav
+!samples/.gitkeep
+outputs/
+models/
+external/CosyVoice/
+*.egg-info/
+.DS_Store
+.pytest_cache/
+.mypy_cache/
+backend/data/uploads/*
+!backend/data/uploads/.gitkeep