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/run_server.sh

@@ -0,0 +1,19 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
+cd "$ROOT"
+
+if [[ ! -x "$ROOT/.venvs/api/bin/uvicorn" ]]; then
+  echo "API venv 없음. ./scripts/setup_api.sh 실행"
+  exit 1
+fi
+
+export PYTHONPATH="$ROOT"
+# shellcheck disable=SC1091
+[[ -f "$ROOT/.env" ]] && source "$ROOT/.env"
+
+exec "$ROOT/.venvs/api/bin/uvicorn" backend.app.main:app \
+  --host "${TTS_HOST:-0.0.0.0}" \
+  --port "${TTS_PORT:-8000}" \
+  --reload