feat: complete MVP setup with CI/CD, Makefile, docker, and backlog docs

Dockerfile

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+# ==============================================================================
+# Stage 1: Build React Frontend PWA
+# ==============================================================================
+FROM node:20-alpine AS frontend-builder
+WORKDIR /app/web
+
+COPY web/package*.json ./
+RUN npm ci || npm install
+
+COPY web/ ./
+RUN npm run build
+
+# ==============================================================================
+# Stage 2: Build Go Backend Binary
+# ==============================================================================
+FROM golang:1.22-alpine AS backend-builder
+WORKDIR /app
+
+RUN apk add --no-cache git
+
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+COPY --from=frontend-builder /app/web/dist ./web/dist
+
+RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-s -w" -o rsspipe cmd/server/main.go
+
+# ==============================================================================
+# Stage 3: Minimal Production Runtime
+# ==============================================================================
+FROM alpine:3.20
+
+RUN apk --no-cache add ca-certificates tzdata
+
+WORKDIR /app
+
+COPY --from=backend-builder /app/rsspipe /app/rsspipe
+COPY --from=frontend-builder /app/web/dist /app/web/dist
+
+RUN mkdir -p /app/data
+
+ENV PORT=8080 \
+    DB_PATH=/app/data/rsspipe.db \
+    GIN_MODE=release
+
+VOLUME ["/app/data"]
+
+EXPOSE 8080
+
+ENTRYPOINT ["/app/rsspipe"]