Add read-only web UI

Serves Pete's classified-story archive over HTTP alongside the Matrix
bot. Three sections (gaming/tech/politics), Animal-Crossing-vibe Tailwind
templates, day/night palette driven by the visitor's browser clock.
Web port configurable via web.listen_addr and ${PETE_WEB_PORT} in
docker-compose. Tailwind built in a node stage in the Dockerfile so
deployments don't need node at runtime.

Dockerfile

@@ -1,8 +1,17 @@
-FROM golang:1.24-alpine AS builder
+FROM node:20-alpine AS css
+WORKDIR /app
+COPY package.json package-lock.json* ./
+RUN npm install --no-audit --no-fund
+COPY tailwind.config.js ./
+COPY internal/web ./internal/web
+RUN npx tailwindcss -i internal/web/static/css/input.css -o internal/web/static/css/output.css --minify
+
+FROM golang:1.25-alpine AS builder
 WORKDIR /app
 COPY go.mod go.sum ./
 RUN go mod download
 COPY . .
+COPY --from=css /app/internal/web/static/css/output.css ./internal/web/static/css/output.css
 RUN CGO_ENABLED=0 go build -tags goolm -o pete .
 
 FROM alpine:3.21
@@ -10,4 +19,5 @@ RUN apk add --no-cache ca-certificates tzdata
 WORKDIR /app
 COPY --from=builder /app/pete .
 VOLUME /app/data
+EXPOSE 8080
 CMD ["./pete", "-config", "/app/config.yaml"]