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>

src/index.ts

@@ -0,0 +1,63 @@
+import express from "express";
+import swaggerUi from "swagger-ui-express";
+import { existsSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+import { createLogger } from "./infrastructure/logging/logger.js";
+import { bootstrap, config } from "./composition/bootstrap.js";
+import { runtime } from "./infrastructure/config/runtime.js";
+import { SseHub } from "./interfaces/sse/sse.js";
+import { createRouter } from "./interfaces/http/routes.js";
+import { openapiSpec } from "./interfaces/http/openapi.js";
+
+const log = createLogger("server");
+
+const __dirname = dirname(fileURLToPath(import.meta.url));
+const webDist = join(__dirname, "..", "web", "dist");
+
+function main(): void {
+  const ctx = bootstrap();
+  ctx.start();
+
+  const sse = new SseHub(ctx.application);
+  sse.start();
+
+  const server = express();
+  server.use(express.json());
+  server.use("/api", createRouter(ctx.application, sse));
+
+  server.use("/api-docs", swaggerUi.serve, swaggerUi.setup(openapiSpec, {
+    customSiteTitle: "Arb Pulse — API Docs",
+    swaggerOptions: { defaultModelsExpandDepth: 2, defaultModelExpandDepth: 2 },
+  }));
+
+  if (existsSync(webDist)) {
+    server.use(express.static(webDist));
+    server.get("*", (_req, res) => {
+      res.sendFile(join(webDist, "index.html"));
+    });
+  } else {
+    server.get("/", (_req, res) => {
+      res
+        .status(200)
+        .send("Backend running. Frontend not built yet — run `npm run build` (or `npm run dev:web`).");
+    });
+  }
+
+  const httpServer = server.listen(config.port, () => {
+    log.info(`listening on :${config.port} (demo=${runtime.demoMode})`);
+  });
+
+  const shutdown = (): void => {
+    log.info("shutting down");
+    sse.stop();
+    ctx.stop();
+    httpServer.close(() => process.exit(0));
+    setTimeout(() => process.exit(0), 2000);
+  };
+
+  process.on("SIGTERM", shutdown);
+  process.on("SIGINT", shutdown);
+}
+
+main();