Initial boilerplate scaffold for continuum-backend

Bun + ElysiaJS control plane: Drizzle/Postgres schema (printers, farms,
print_jobs, pgvector frame_embeddings), R2 presigned URLs, Redis Streams
frame ingestion queue, REST routes, and the /ws/edge/v1 edge-gateway
WebSocket uplink.

src/index.ts

@@ -0,0 +1,30 @@
+import { Elysia } from "elysia";
+import { cors } from "@elysiajs/cors";
+import { swagger } from "@elysiajs/swagger";
+import { sql } from "drizzle-orm";
+import { db } from "./db";
+import { redis } from "./queue";
+import { authRoutes } from "./routes/auth";
+import { farmRoutes } from "./routes/farms";
+import { printerRoutes } from "./routes/printers";
+import { jobRoutes } from "./routes/jobs";
+import { edgeWsRoute } from "./routes/ws/edge";
+
+const app = new Elysia()
+  .use(cors())
+  .use(swagger({ path: "/docs" }))
+  .get("/health", async () => {
+    const [{ ok }] = await db.execute<{ ok: number }>(sql`select 1 as ok`);
+    const redisPing = await redis.ping();
+    return { status: "ok", db: ok === 1, redis: redisPing === "PONG" };
+  })
+  .use(authRoutes)
+  .use(farmRoutes)
+  .use(printerRoutes)
+  .use(jobRoutes)
+  .use(edgeWsRoute)
+  .listen(Number(process.env.PORT ?? 3000));
+
+console.log(`continuum-backend listening on :${app.server?.port}`);
+
+export type App = typeof app;