Summary: Seedream 4.0 visual model launched

Why It Matters: This shows a new focus on visual AI capabilities.

What Changed:

• The website now promotes "Seedream 4.0" as a new visual model.
• The previous mention of "豆包大模型 1.6" is removed.
• New calls to action to "experience Seedream 4.0" are added.
• The link for "火山方舟" now points to a vision-specific page.