Initial scaffold: React+TS+Vite frontend, FastAPI backend, config system

Dockerfile

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+FROM node:20-slim AS frontend-build
+WORKDIR /app/frontend
+COPY frontend/package.json frontend/package-lock.json* ./
+RUN npm install
+COPY frontend/ ./
+RUN npm run build
+
+FROM python:3.12-slim
+WORKDIR /app
+
+COPY backend/requirements.txt .
+RUN pip install --no-cache-dir -r requirements.txt
+
+COPY backend/ ./backend/
+COPY config.yaml* ./
+COPY --from=frontend-build /app/frontend/dist ./frontend/dist
+
+WORKDIR /app/backend
+EXPOSE 8080
+CMD ["uvicorn", "main:app", "--host", "0.0.0.0", "--port", "8080"]