Refresh HTTP API docs and Postman collection

[HDauven]

Why

Docs and the Postman collection were out of sync with the current rusk HTTP server behavior (RUES /on, WebSocket session, subscriptions, event framing).

What Changed

• Rewrote the HTTP API page to match rusk:
  • WebSocket session id flow (wss://<node>/on)
  • Subscribe/unsubscribe via HTTP GET/DELETE to /on/... with Rusk-Session-Id
  • Event framing: u32 LE header_len + JSON header + data (Content-Location)
• Clarified binary vs text responses (Accept: application/octet-stream) and hex (0x...) decoding behavior.
• Updated the Postman collection (variables, grouping, corrected requests).

Files

• src/content/docs/developer/integrations/http-api.md
• public/dusk_api_postman_collection.json

Test

• npm run build