Add chat message API endpoints for operators and guests

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Description

## Task
Add controller endpoints for sending and retrieving chat messages in support sessions.

## Endpoints

### For Operators (authenticated)
```ruby
# POST /remote_support/sessions/:id/messages
# Body: { content: "message text" }
# Returns: { id, content, participant_type, participant_name, created_at }
```

### For Guests (token-authenticated)
```ruby
# POST /support/guest/:token/messages
# Body: { content: "message text", guest_name: "optional name" }
# Returns: { id, content, participant_type, participant_name, created_at }
```

### Message History
```ruby
# GET /remote_support/sessions/:id/messages
# Returns: [{ id, content, participant_type, participant_name, created_at }, ...]
# For operators: requires authentication
# Accessible even after session ends (for review)
```

### Guest Message History
```ruby
# GET /support/guest/:token/messages
# Returns message history for active sessions only
```

## Controller Structure
- Add methods to `RemoteSupportSessionsController` for operator endpoints
- Add methods to `RemoteSupportGuestController` for guest endpoints

## Files to Modify
- `app/controllers/remote_support_sessions_controller.rb`
- `app/controllers/remote_support_guest_controller.rb`
- `config/routes.rb`
- `spec/requests/remote_support_sessions_chat_spec.rb`
- `spec/requests/remote_support_guest_chat_spec.rb`