Requested by @Bentlybro
Anthropic released [Claude Opus
4.7](https://www.anthropic.com/news/claude-opus-4-7) today. This PR adds
it to the platform's supported model list.
## Why
Users and developers need access to `claude-opus-4-7` via the platform's
LLM block and API. The model is available on Anthropic's API today.
## What
- Adds `CLAUDE_4_7_OPUS = "claude-opus-4-7"` to the `LlmModel` enum
- Adds corresponding `ModelMetadata` entry: 200k context, 128k output,
price tier 3 ($5/M input, $25/M output — same as Opus 4.6)
## How
Two lines added to `llm.py`, following the exact same pattern as all
other Anthropic model additions. No migrations, no frontend changes
needed — the frontend reads model metadata from the backend's JSON
schema endpoint automatically.
Closes SECRT-2248
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Co-authored-by: Bentlybro <Github@bentlybro.com>
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