feat: add llmman provider

[ericcurtin]

Description

Adds llmman, which runs local models distributed as OCI artifacts and serves an OpenAI-compatible API on port 17434 (it also speaks the Ollama and Anthropic APIs, but Chatbox only needs the OpenAI one).

Because the API is OpenAI-compatible, the definition and model class mirror lmstudio.ts rather than ollama.ts — Llmman extends OpenAICompatible, same as LMStudio. It's registered alongside the other local providers in the places that treat a provider as usable without an API key: useProviders, settingActions, llm_utils, and the $providerId route list.

Additional Notes

No provider icon is included. ProviderIcon has no branch for llmman, so it falls through to the empty <svg> and renders blank. Only Custom, OpenAIResponses and VolcEngine are in that position today, so this is a visible gap rather than the norm. I didn't want to guess at a 24×24 monochrome mark for someone else's logo — happy to add one if you tell me what you'd accept, or to take a path you provide.

Testing: tsc --noEmit reports 6005 errors both before and after my change, verified against a stashed baseline. That baseline is high because I typechecked without installing dependencies, so most of it is module resolution — it's the delta that's meaningful here, not the absolute number. An earlier iteration showed a delta of 2, which is how I found a missing aiProviderNameHash entry in src/shared/models/index.ts; both are fixed and the delta is now zero.

Not verified: no run of the app against a live server, so the settings UI and a real completion are untested.

AI-assisted (OpenCode), reviewed before submitting.

Contributor Agreement

I've deliberately left the box below unticked: it's a rights grant that the account owner should make personally rather than have tooling tick on their behalf. @ericcurtin will confirm it in a comment below.

[ ] I have read and agree with the above statement.

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