[Feature] Bedrock: support Anthropic Claude Opus 4.7

[phpcyy]

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1. Is this request related to a challenge you're experiencing? Tell me about your story.

Claude Opus 4.7 has been GA on AWS Bedrock since 2026-04-16, but the Bedrock plugin's anthropic-claude.yaml still stops at 4.6, so I can't select it from the Dify model picker.

Please add Claude Opus 4.7. Model IDs (per the official model card):

• anthropic.claude-opus-4-7
• us. / eu. / jp. / au. / global. cross-region profiles (note: no apac. profile)

Key spec: 1M context, 128K max output, vision + tool-call + prompt caching + streaming.

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2. Additional context or comments

For Opus 4.7, temperature / top_p / top_k are no longer accepted, and extended thinking only supports thinking.type: "adaptive" — the request builder should be gated on model ID to avoid 400s.

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3. Can you help us with this feature?

• I am interested in contributing to this feature.