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.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

package.json

@@ -0,0 +1,30 @@
+{
+  "name": "@continuum/backend",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "bun run --watch src/index.ts",
+    "start": "bun run src/index.ts",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "drizzle-kit migrate",
+    "db:studio": "drizzle-kit studio",
+    "typecheck": "tsc --noEmit"
+  },
+  "dependencies": {
+    "elysia": "^1.1.26",
+    "@elysiajs/cors": "^1.1.1",
+    "@elysiajs/jwt": "^1.1.1",
+    "@elysiajs/swagger": "^1.1.6",
+    "@aws-sdk/client-s3": "^3.658.1",
+    "@aws-sdk/s3-request-presigner": "^3.658.1",
+    "drizzle-orm": "^0.33.0",
+    "postgres": "^3.4.4",
+    "ioredis": "^5.4.1"
+  },
+  "devDependencies": {
+    "drizzle-kit": "^0.24.2",
+    "@types/bun": "^1.1.10",
+    "typescript": "^5.6.2"
+  }
+}