WS Endpoints

[badnikhil]

This PR extends the WebSocket endpoints

Endpoint	Behavior
/ws/ticker/{interval}	Server-push: sends {"type":"ticker","tick":n,"interval":i} every interval seconds (1–60). Out-of-range interval → close 1008. Tests passive receiving / live feeds.
/ws/close/{code}	Sends one message, then closes with the requested close code (1000–1003, 1007–1014, 3000–4999) so clients can verify close-code handling. Reserved/invalid codes → close 1008.
/ws/auth	Token-gated echo. Authenticate via Authorization: Bearer apidash-test-ws-token header or ?token= query param (browsers can't set WS headers). Missing/invalid → close 1008. Lets clients verify custom handshake headers/params are actually transmitted.
/ws/broadcast	Chat-style fan-out: every message is delivered to all connected clients (including sender). Useful for multi-client/multi-tab testing.

Testing

• pytest tests/ws/ → 16 passed (new tests for ticker timing, close codes,auth accept/reject via header and query, broadcast fan-out across 3 clients,