[middleware] WebSocket middleware (websocket)

[FumingPower3925]

WebSocket Middleware (websocket)

WebSocket upgrade and connection management.

Separate Go module: github.com/goceleris/middlewares/websocket

External Dependency

github.com/gorilla/websocket

Core Integration

Uses celeris core Hijack() for raw connection access:

1. Validates the WebSocket upgrade request
2. Calls c.Hijack() to get the raw net.Conn
3. Hands the connection to gorilla/websocket.Upgrade()
4. Provides a Handler callback with a *websocket.Conn

Config

• Handler, CheckOrigin, Subprotocols, ReadBufferSize/WriteBufferSize, HandshakeTimeout

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Migrated from goceleris/middlewares#35