Add OpenPaths provider

[lee101]

What

Adds OpenPaths as a model provider. OpenPaths is an OpenAI-compatible model gateway (similar in shape to the existing OpenRouter integration), so this change mirrors the OpenRouter wiring as closely as possible.

Users add their OpenPaths API key in Settings (key page: https://openpaths.io/account), and OpenPaths models become available alongside the other providers.

Changes

• src/core/chorus/ModelProviders/ProviderOpenPaths.ts (new): OpenAI-compatible provider, copied from ProviderOpenRouter with the base URL set to https://openpaths.io/v1.
• src/core/chorus/Models.ts: register ProviderOpenPaths in the getProvider switch; add openpaths to the ProviderName union and ApiKeys; add downloadOpenPathsModels (fetches https://openpaths.io/v1/models, namespaces ids as openpaths::); add the openpaths context-limit pattern.
• src/core/chorus/api/ModelsAPI.ts: download OpenPaths models when an OpenPaths key is present, plus a useRefreshOpenPathsModels hook wired into the refresh flow (mirrors OpenRouter).
• src/core/utilities/ProxyUtils.ts: add openpaths to the provider-to-key and display-name maps.
• src/core/utilities/Settings.ts: add openpaths to the persisted apiKeys.
• src/ui/components/ApiKeysForm.tsx: add an OpenPaths entry (links to https://openpaths.io/account).
• src/ui/components/ui/provider-logo.tsx: add an openpaths case to satisfy the exhaustiveness check (placeholder icon for now).

Additive and minimal — no existing behavior changed. OpenRouter-specific aggregation (web search) was intentionally left untouched since it doesn't map to a plain OpenAI-compatible gateway.

Testing

• npx tsc --noEmit — passes
• npx prettier --check on changed files — passes
• npx eslint on changed files — passes
• Full Tauri/Rust build not run (heavy); changes are additive and type-checked.

🤖 Generated with Claude Code

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[chatgpt-codex-connector]

Surface OpenPaths models in the picker

When a user adds an OpenPaths key here, fetchModelConfigs can download openpaths:: model configs, but the model picker never renders that provider: ManageModelsBox only groups OpenRouter/local plus direct providers anthropic, openai, google, perplexity, and grok (src/ui/components/ManageModelsBox.tsx:497-508). Since openpaths is not in any group, downloaded OpenPaths models are filtered out of picker/search and the new provider cannot be selected through the UI.

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