docs: add Bruno API request for WebSocket connection

Add Bruno v3.0 request for testing WebSocket endpoint:
- WebSocket connection type
- JWT token authentication via query parameter
- Ping message body for heartbeat testing
- Assertions for successful WebSocket upgrade (101 status)

Provides API documentation and testing capability for
WebSocket connection functionality per project standards.

bruno/websocket_connect.bru

@@ -0,0 +1,30 @@
+meta {
+  name: "WebSocket - Connect and Receive Updates"
+  type: websocket
+  seq: 1
+}
+
+vars {
+  token: ""
+}
+
+websocket {
+  url: "{{ baseUrl }}/ws/sync?token={{ token }}"
+  body: {
+    type: "ping",
+    timestamp: "2026-01-30T20:00:00Z"
+  }
+  auth: {
+    type: bearer
+    token: "{{ token }}"
+  }
+  headers: {
+    Authorization: "Bearer {{ token }}"
+  }
+}
+
+assert {
+  res.status == 101
+  res.headers.contains("Connection", "upgrade")
+  res.headers.contains("Upgrade", "websocket")
+}