Implement Phase 2 Frontend with Ant Design and verify Data Ingestion

- Created `frontend/` React+Vite app using Ant Design (Dark Theme).
- Implemented `App.jsx` to display listening history and calculated "Vibes".
- Updated `backend/app/ingest.py` to fix ReccoBeats ID parsing.
- Updated `backend/app/schemas.py` to expose audio features to the API.
- Updated `README.md` with detailed Docker hosting instructions.
- Added `TODO.md` for Phase 3 roadmap.
- Cleaned up test scripts.

frontend/Dockerfile

@@ -1,9 +1,12 @@
-FROM node:18-alpine as build
+# Stage 1: Build the React app
+FROM node:18 as build
 WORKDIR /app
 COPY package*.json ./
 RUN npm install
 COPY . .
 RUN npm run build
+
+# Stage 2: Serve with Nginx
 FROM nginx:alpine
 COPY --from=build /app/dist /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/conf.d/default.conf