implement simple websocket chat

[PAY2109]

Description

Adds a WebSocket-based chat channel for OmegaClaw so it can talk to a web chat backend through a small JSON protocol.

This change:

• adds a new channels/wschat.py adapter
• supports optional bearer auth via WS_TOKEN
• handles reconnects with backoff, resume via last_seen_seq, inbound deduplication, and outbound buffering while disconnected
• wires commchannel=websocket into the MeTTa channel dispatch
• extends scripts/omegaclaw bootstrap/start flow to collect and pass WS_URL / WS_TOKEN
• adds the websockets dependency to the runtime and Docker image

Issue fixed: OmegaClaw can now be integrated with a WebSocket chat service without relying on IRC, Telegram, or Slack.

How Has This Been Tested?

Manual test scenarios:

1. Run scripts/omegaclaw, select WebSocket Chat, provide a valid ws:// or wss:// URL, and confirm the container starts with commchannel=websocket.
2. Connect OmegaClaw to a test WebSocket server and send:
   {"type":"user_message","seq":1,"text":"hello"}
   Verify the message is received and processed by the agent.
3. Verify agent replies are sent back as agent_message JSON frames with client_seq and text.
4. Drop the WebSocket connection and confirm the client reconnects automatically.
5. After reconnect, verify the client sends a resume frame with last_seen_seq and missed user_message frames are replayed once without duplication.
6. Send a reply while the socket is disconnected and confirm it is buffered and flushed after reconnect.
7. If WS_TOKEN is configured, verify the connection includes Authorization: Bearer <token>.

Checklist

• The code generated by LLM is reviewed by the PR creator
• Self-review completed
• Test scenarios above are passed with the version of the code from PR