Use Sonnet 5 for hosted text routing

[ComputelessComputer]

Summary:

• Pin hosted llm-proxy text routes to anthropic/claude-sonnet-5.
• Leave audio model routing unchanged.

Validation:

• pnpm exec dprint fmt crates/llm-proxy/src/model.rs
• cargo test -p llm-proxy
• cargo check -p llm-proxy

---

Note

Medium Risk
Changes which model all hosted text LLM traffic uses, affecting cost, latency, and behavior for every chat/title/enhance request without a custom override.

Overview
Hosted llm-proxy text routing no longer uses the rolling ~anthropic/claude-sonnet-latest alias. Chat, Title, Enhance, tool_calling, and default paths now resolve to anthropic/claude-sonnet-5.

Audio routing is unchanged (Gemini and Voxtral models). Resolver tests were updated to expect Sonnet 5.

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