Create SendChatMessageService for support session chat

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Description

## Task
Create service objects for sending messages in support sessions, handling both operator and guest message creation.

## Service: RemoteSupport::SendChatMessageService
```ruby
module RemoteSupport
  class SendChatMessageService < BaseService
    option :session
    option :content
    option :participant_type  # :operator or :guest
    option :user, optional: true  # present for operators
    option :guest_name, optional: true  # present for guests

def call
      # Validate session is active/pending (not ended)
      # Create message record
      # Trigger broadcast (will be consumed by WebSocket channel)
      # Return Success(message) or Failure
    end
  end
end
```

## Broadcast Mechanism
After message creation, trigger a broadcast that:
1. For operators: publishes to NATS `tenants.{tenant}.support_sessions.{id}.messages`
2. For guests: triggers ActionCable broadcast to session channel

## Files to Create
- `app/services/remote_support/send_chat_message_service.rb`
- `spec/services/remote_support/send_chat_message_service_spec.rb`