Extract all HTTP route handling (bootstrap, sessions, settings, media,
commands, sidebar state, static serving, token management) into a new
GatewayHTTPHandler class in nanobot/channels/ws_http.py.
WebSocketChannel is reduced from 1907 to 1372 lines (-28%), retaining
only WebSocket connection management and message dispatch.
No behavior change. 3730 tests pass, 0 failures.
Shared HTTP utility functions (path parsing, response builders, auth
helpers) now live in ws_http.py with websocket.py importing from there,
avoiding circular dependencies.
Backwards-compat property aliases on WebSocketChannel ensure existing
tests continue to work without modification.
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