feat: webowa wersja Video & Sound Downloader Pro (NestJS + React)

Odwzorowanie desktopowego v6.5.6: tryby MP3/MP4/PLAYLISTA/FACEBOOK,
jakość/format, napisy, log na żywo (SSE), STOP. Docker + Gitea CI/CD,
deploy na videodownloader.naurecki.pl.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/web/Dockerfile

@@ -0,0 +1,13 @@
+# --- build: bundling Vite/React ---
+FROM node:20-bookworm-slim AS build
+WORKDIR /app
+COPY apps/web/package.json ./
+RUN npm install
+COPY apps/web/ ./
+RUN npm run build
+
+# --- serwowanie statyk + proxy /api ---
+FROM nginx:alpine
+COPY apps/web/nginx.conf /etc/nginx/conf.d/default.conf
+COPY --from=build /app/dist /usr/share/nginx/html
+EXPOSE 80