Add Docker support and refactor data layer

Dockerfile

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+FROM golang:1.24-alpine AS builder
+
+WORKDIR /app
+
+# Install build dependencies
+RUN apk add --no-cache gcc musl-dev
+
+# Copy go mod files first for layer caching
+COPY go.mod go.sum ./
+RUN go mod download
+
+# Copy source code
+COPY *.go ./
+COPY static/ ./static/
+
+# Build the binary
+RUN CGO_ENABLED=1 go build -o 1440.news .
+
+# Runtime stage
+FROM alpine:latest
+
+WORKDIR /app
+
+# Install runtime dependencies
+RUN apk add --no-cache ca-certificates tzdata
+
+# Copy binary from builder
+COPY --from=builder /app/1440.news .
+COPY --from=builder /app/static ./static
+
+# Create feeds directory
+RUN mkdir -p feeds
+
+# Expose dashboard port
+EXPOSE 4321
+
+CMD ["./1440.news"]