Fix registered local models missing from the chat picker

[XYAIStudio]

Root cause

Model-page register (Ollama tag / GGUF) could succeed while the conversation picker still could not list or invoke those models.

Three separate gaps stacked:

1. Resolved/usable filters required a real API key and base URL. LocalServiceCard and empty-key Ollama rows were dropped from GET /providers/resolved and ProviderStore.is_model_ref_usable, so the picker never showed them (or send rejected the ref).
2. Two create paths. Recommended install wrote a provider named ollama (kind=ollama) without enabling it; GGUF register wrote Ollama (Local). LocalServiceCard created a third row with all models disabled and enabled=false. Chat never saw a usable local catalog.
3. Frontend did not refresh. Chat loaded models only on mount/focus. After register, the recommended-install path also called the dead /models API (404), so the UI treated a successful backend register as “need provider”.

PR #30 only fixed Windows register 500s. This change wires register → catalog → picker → harness 127.0.0.1:11434.

What changed

• upsert_ollama_model is the single write path: enable the Ollama row, fill api_key=ollama + http://127.0.0.1:11434/v1, mark the model enabled, set ollama_service_enabled.
• list_resolved_models / ProviderStore fill those defaults so local refs are listed, usable, and built into harness configs. ollama/<tag> aliases resolve to the existing local row.
• Chat listens for octop:models-changed after Models-page register/install.
• If Ollama is down, stream errors classify as stream_errors.local_runtime (zh+en) with a link to /models, not a silent no-op.

How to verify

• Register an already-pulled Ollama tag or a GGUF from Models. Open 对话区: the tag appears and can be selected.
• Send a message: request goes to local Ollama (11434). If the daemon is stopped, the UI shows the start-Ollama guidance.
• Cloud providers still list and send as before.

Local verification

• uv run ruff check src tests — passed
• uv run pytest tests/unit — 2953 passed, 4 skipped
• npx vitest run on chatStreamError / presetUtils / LocalHardwarePanel / ChatInputActionsRow — 17 passed
• mypy --strict on touched provider modules — clean
• npx tsc --noEmit — clean

Checklist

• Root cause stated
• zh+en copy for new stream error
• CHANGELOG updated
• CI green