chore: remove legacy simulator pages and mobile app scaffold

Backend/README.md

@@ -175,26 +175,6 @@ OpenAPI docs are generated from Zod/OpenAPI definitions:
 | `GET /openapi.json` | OpenAPI 3 spec (JSON) |
 | `GET /docs` | Swagger UI |
 
-### Web Mobile Simulator
-Use `GET /sim/mobile-sim.html` to run the full single-page browser simulator that behaves like the mobile app.
-
-Split-page entrypoints are also available:
-- `GET /sim/mobile-sim-auth.html`
-- `GET /sim/mobile-sim-onboarding.html`
-- `GET /sim/mobile-sim-camera.html`
-- `GET /sim/mobile-sim-client.html`
-- `GET /sim/mobile-sim-activity.html`
-- `GET /sim/mobile-sim-settings.html`
-
-Architecture reference page:
-- `GET /sim/backend-architecture.html`
-
-All simulator pages support the same flow:
-- Register as `camera` or `client`
-- Connect Socket.IO with bearer device token
-- Camera: process incoming stream requests, negotiate WebRTC, start/end motion events
-- Client: create links, request streams, and negotiate WebRTC viewing
-
 ### Admin Dashboard
 Access `/admin` with Basic auth to: