Add initial files for Audio Dashboard Management System

- Created .env.example for environment variable configuration.
- Added docker-compose.yml for service orchestration.
- Implemented frequency response extraction in extract_frequency_response.py and convert_to_frequency_db.py.
- Generated output files: frequency_response_detailed.json, frequency_response_points.json, frequency_response.csv, and frequency_response_curve.png.
- Included sample measurement data for FiiO FA19 in CSV format.

frontend/Dockerfile

@@ -0,0 +1,31 @@
+FROM node:18-alpine AS builder
+
+WORKDIR /app
+
+# Install pnpm
+RUN npm install -g pnpm
+
+# Copy package files
+COPY package.json pnpm-lock.yaml* ./
+
+# Install dependencies
+RUN pnpm install --frozen-lockfile || pnpm install
+
+# Copy source code
+COPY . .
+
+# Build the application
+RUN pnpm build
+
+# Production stage
+FROM nginx:alpine
+
+# Copy built assets from builder stage
+COPY --from=builder /app/dist /usr/share/nginx/html
+
+# Copy nginx configuration
+COPY nginx.conf /etc/nginx/conf.d/default.conf
+
+EXPOSE 80
+
+CMD ["nginx", "-g", "daemon off;"]