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/queue/index.ts

@@ -0,0 +1,33 @@
+import Redis from "ioredis";
+
+export const redis = new Redis(process.env.REDIS_URL ?? "redis://localhost:6379", {
+  maxRetriesPerRequest: 3,
+});
+
+export const CAMERA_FRAMES_STREAM = "stream:camera_frames";
+
+export interface FrameIngestionTask {
+  farmId: string;
+  printerId: string;
+  printJobId: string | null;
+  r2ObjectKey: string;
+  capturedAt: string;
+}
+
+/** Pushes a frame-ingestion task for continuum-ai-worker to pick up via XREADGROUP. */
+export async function enqueueFrameIngestion(task: FrameIngestionTask): Promise<string> {
+  return redis.xadd(
+    CAMERA_FRAMES_STREAM,
+    "*",
+    "farmId",
+    task.farmId,
+    "printerId",
+    task.printerId,
+    "printJobId",
+    task.printJobId ?? "",
+    "r2ObjectKey",
+    task.r2ObjectKey,
+    "capturedAt",
+    task.capturedAt,
+  ) as Promise<string>;
+}