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>

scripts/setup_api.sh

@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# FastAPI 서버용 경량 venv
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+VENV="$ROOT/.venvs/api"
+
+python3 -m venv "$VENV"
+"$VENV/bin/pip" install -U pip wheel
+"$VENV/bin/pip" install -r "$ROOT/backend/requirements.txt"
+
+echo "API venv 준비 완료: $VENV"
+echo "실행: $VENV/bin/uvicorn backend.app.main:app --host 0.0.0.0 --port 8000"