feat: status/stories (post, view, delete)

[longevityboris]

Add WhatsApp Status (Stories) support:

• post_text_status(text, background_color) — post text status
• post_media_status(data, mime, caption) — post image/video status
• Inbound: surface status updates from contacts
• delete_status(status_id) — delete own status

Sends to status@broadcast JID. Requires adjusting should_ignore_jid to selectively allow status messages when the consumer opts in.