Initial commit: Arb Pulse monolith with CI and optional Fly deploy.

Real-time BTC cross-exchange arbitrage detection (Kraken, Bybit, OKX, Binance)
with React dashboard, GitHub Actions CI, and documented Fly.io deploy workflow.

Co-authored-by: Cursor <cursoragent@cursor.com>

Dockerfile

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+# Stage 1 — Vite frontend (web/dist)
+FROM node:20-alpine AS web-build
+
+WORKDIR /app
+
+# web/package.json links "arb-pulse": "file:.." — root package.json required for npm ci
+COPY package.json package-lock.json ./
+COPY web/package.json web/package-lock.json ./web/
+
+RUN npm ci --prefix web
+
+COPY web/ ./web/
+
+RUN npm run build --prefix web
+
+# Stage 2 — production server (tsx, no tsc emit)
+FROM node:20-alpine
+
+WORKDIR /app
+
+ENV NODE_ENV=production
+ENV PORT=8080
+
+COPY package.json package-lock.json ./
+RUN npm ci --omit=dev
+
+COPY src/ ./src/
+COPY --from=web-build /app/web/dist ./web/dist
+
+EXPOSE 8080
+
+CMD ["npm", "start"]