fix(local): read the size in a Featherless-shaped listing row's id

[jamalkamaladdin]

What

modules/llm/profile/fingerprint.py: from_remote reads a stated size out of a listing row's id when it has no hugging_face_id.

An empty owned_by and no slash in an id leaves vendor unset instead of an empty string.

Why

Fixes #1988

How to test

cd surfsense_local/backend
uv run pytest -m unit tests/unit/llm/profile/
uv run ruff check modules/llm/profile/fingerprint.py
cd ../.. && python scripts/check_docs.py

High-level PR Summary

This PR fixes how the system extracts model size and vendor information from API listing rows that lack a hugging_face_id field. Previously, models from providers like Featherless (which don't include HuggingFace IDs) were misclassified as frontier models regardless of their actual size. The fix enables reading size information directly from the model ID and properly handles edge cases like empty vendor names, ensuring models like qwen3-4b are correctly identified as 4B parameter models instead of being treated as frontier-tier.

⏱️ Estimated Review Time: 5-15 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_local/backend/tests/unit/llm/profile/test_fingerprint.py
2	surfsense_local/backend/modules/llm/profile/fingerprint.py
3	docs/architecture/local-models/selection.md

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