fix(ollama): ignore cloud models in installed detection

[snvtac]

Fixes #619.

Problem

Ollama's /api/tags can include cloud-hosted models such as qwen3-coder:480b-cloud. The installed-model builder was inserting every tag and its family stem into the installed set, so a cloud tag could insert qwen3-coder and incorrectly mark unrelated HuggingFace Qwen3-Coder variants as locally installed.

Fix

• Parse the optional Ollama size field from tag responses.
• Centralize Ollama installed-set construction so detect_with_installed and installed_models_counted share the same behavior.
• Skip cloud entries before inserting tag names or family stems when the tag suffix is -cloud or size == 0.
• Keep local-model detection tolerant of older/missing size fields when the tag does not look like a cloud model.
• Add unit tests covering the Ollama cloud models cause false "installed" detection for unrelated HuggingFace models #619 false positive and missing-size local model behavior.

Validation

• cargo fmt --all -- --check
• git diff --check
• cargo test -p llmfit-core test_ollama -- --nocapture
• make test
• make clippy currently fails on existing upstream main warnings outside this PR's scope, including llmfit-core/src/fit.rs, llmfit-core/src/hardware.rs, llmfit-core/src/models.rs, and llmfit-core/src/bench.rs.

[AlexsJones]

Thanks for this, @snvtac 🙏 — flagging for you that #650 landed on main and closed the underlying issue (#619), so the cloud-model false-positive this targets is now fixed on main. That makes this PR a duplicate of merged work, so you may want to close it.

One thing your version did that's worth preserving: modelling the Ollama size field as Option<u64> (rather than #[serde(default)]), so older Ollama servers that omit size don't get every local model misclassified as cloud — with a test for it. If you're up for it, a small focused follow-up PR for just that tolerance would be a welcome hardening on top of what merged. Either way, appreciated the contribution.

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