Initial MVP: multiplexer + chat DB

src/index.ts

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+import Fastify from "fastify";
+import cors from "@fastify/cors";
+import swagger from "@fastify/swagger";
+import swaggerUI from "@fastify/swagger-ui";
+import sensible from "@fastify/sensible";
+import { env } from "./env.js";
+import { registerRoutes } from "./routes.js";
+
+const app = Fastify({
+  logger: {
+    transport: {
+      target: "pino-pretty",
+      options: { colorize: true, translateTime: "SYS:standard" },
+    },
+  },
+});
+
+await app.register(cors, { origin: true, credentials: true });
+
+await app.register(swagger, {
+  openapi: {
+    info: {
+      title: "LLM Multiplexer Backend",
+      version: "0.1.0",
+    },
+  },
+});
+
+await app.register(swaggerUI, { routePrefix: "/docs" });
+await app.register(sensible);
+
+app.setErrorHandler((err, _req, reply) => {
+  const e = err as any;
+  const statusCode = e.statusCode ?? 500;
+  reply.status(statusCode).send({
+    error: true,
+    message: e.message ?? String(e),
+    statusCode,
+  });
+});
+
+await registerRoutes(app);
+
+await app.listen({ port: env.PORT, host: env.HOST });
+app.log.info(`listening on http://${env.HOST}:${env.PORT}`);