Add OpenPaths model provider

[lee101]

What

Adds OpenPaths as a first-class model provider.

OpenPaths is an OpenAI-compatible model gateway (same role as OpenRouter): a single
endpoint that routes to many underlying models. It exposes the standard OpenAI API at
https://openpaths.io/v1 (chat completions + /v1/models), authenticates with a
Bearer API key, and offers an openpaths/auto router plus task-specific auto-*
tiers (code / fast / cheap / reasoning / vision / image).

Because it is fully OpenAI-compatible, the implementation mirrors the existing
OpenRouter / SiliconFlow provider definitions rather than introducing any new SDK.

Changes

• src/shared/types/provider.ts — add OpenPaths = 'openpaths' to ModelProviderEnum.
• src/shared/providers/definitions/openpaths.ts — provider definition: type: OpenAI,
  apiHost: https://openpaths.io/v1, curated openpaths/auto + tier model ids, and
  links back to openpaths.io.
• src/shared/providers/definitions/models/openpaths.ts — model class extending the
  shared OpenAICompatible base, pointed at the OpenPaths gateway (model listing reuses
  the standard /v1/models fetch).
• src/shared/providers/index.ts — register the provider in the registry.
• src/shared/models/index.ts — add the provider name-hash entry (required, the hash is
  Record<ModelProviderEnum, string>) and a menu option (not featured).
• src/shared/utils/llm_utils.ts — list OpenPaths among the OpenAI-compatible providers.
• src/renderer/static/icons/providers/openpaths.png — provider icon.

The change is purely additive; no existing provider is modified and OpenPaths is not
placed ahead of incumbents in any featured list.

Testing

• npx tsc --noEmit — no new type errors introduced (the only errors present are
  pre-existing TanStack Router routeTree.gen codegen errors, unrelated to this change
  and present on a clean checkout before the build step generates that file).
• biome lint on the changed files — clean for the new files (the only warnings are
  pre-existing console.debug calls in providers/index.ts).

🤖 Generated with Claude Code

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Remove image-generation router from chat defaults

When OpenPaths is configured, this entry is treated as a chat model because ModelSelector includes models with no type or type === 'chat', but OpenPaths documents openpaths/auto-image as an image-generation model served via the image endpoint. Since the new OpenPaths class extends OpenAICompatible without image-generation support, selecting “Auto Image” in a chat session sends it through chat completions with vision capabilities and will fail for users who pick that default model; either mark/remove it from the chat defaults or add the provider to the image-generation path.

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