Add TypeScript web dashboard for browsing archived briefings

Zero-runtime-dependency Node 24 server + esbuild-bundled client.
Reads reports/*.json only (never the daemon's SQLite/WAL): summary
card, dual Seoul/New York clocks, holiday-gap rows in the briefing
list, per-symbol close chart with table view, error log.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

dashboard/Dockerfile

@@ -0,0 +1,16 @@
+FROM node:24-slim AS build
+WORKDIR /app
+COPY package.json package-lock.json ./
+RUN npm ci
+COPY tsconfig.json ./
+COPY src ./src
+COPY web ./web
+RUN npm run build
+
+FROM node:24-slim
+WORKDIR /app
+ENV NODE_ENV=production US2KR_REPORTS_DIR=/data/reports PORT=8090
+COPY --from=build /app/dist ./dist
+EXPOSE 8090
+USER node
+CMD ["node", "dist/server.js"]