feat: new design + dockerize app

Dockerfile

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+# Multi-stage build for optimized image size
+FROM golang:1.23-alpine AS backend-builder
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+# Set working directory for backend
+WORKDIR /app/backend
+
+# Copy go mod files
+COPY backend/go.mod backend/go.sum ./
+
+# Download dependencies
+RUN go mod download
+
+# Copy backend source code
+COPY backend/ ./
+
+# Build the application
+RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o main .
+
+# Final stage - minimal image
+FROM alpine:latest
+
+# Install ca-certificates for HTTPS requests
+RUN apk --no-cache add ca-certificates tzdata
+
+# Set timezone (adjust as needed)
+ENV TZ=Europe/Paris
+
+WORKDIR /app
+
+# Copy the built binary from builder
+COPY --from=backend-builder /app/backend/main .
+
+# Copy frontend files
+COPY frontend/ ./frontend/
+
+# Copy backend data file
+COPY backend/date_link.txt ./
+
+# Expose port
+EXPOSE 8080
+
+# Run the application
+CMD ["./main"]