Create ActionCable channel for guest chat subscriptions

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Description

## Task
Create an ActionCable channel that allows unauthenticated guests to subscribe to chat messages for their support session.

## Why ActionCable?
- Guests have no NATS device/authentication
- Need WebSocket for real-time without polling
- ActionCable is already available in Rails stack
- Can authenticate via session token in connection params

## Channel Design
```ruby
# app/channels/support_session_chat_channel.rb
class SupportSessionChatChannel < ApplicationCable::Channel
  def subscribed
    session = find_session_by_token(params[:token])
    
    if session&.can_join?
      stream_from "support_session_chat:#{session.id}"
      @session = session
    else
      reject
    end
  end

def unsubscribed
    stop_all_streams
  end

def receive(data)
    # Handle incoming messages from WebSocket
    # Validate and save via SendChatMessageService
  end
end
```

## Connection Authentication
Modify `ApplicationCable::Connection` to support token-based auth for guests (in addition to existing user auth).

## Broadcast Integration
Update `SendChatMessageService` to broadcast via:
```ruby
ActionCable.server.broadcast(
  "support_session_chat:#{session.id}",
  message.to_broadcast_payload
)
```

## Files to Create/Modify
- `app/channels/support_session_chat_channel.rb`
- `app/channels/application_cable/connection.rb` (modify for guest tokens)
- `spec/channels/support_session_chat_channel_spec.rb`