fix(controller): use per-user models dir and OS temp dir defaults on Windows

[luminary19]

Summary

The models-dir default (/models) and the log fallback dir (/tmp) are POSIX literals; on Windows the former points at a non-existent drive root and the latter throws inside the fallback path itself. This defaults the models dir to ~/models on win32 (POSIX keeps /models), replaces the /tmp literal with os.tmpdir() (which is /tmp on Linux), and comments the template default in .env.example so the platform default applies unless overridden. Fixes #186.

Validation

cd controller
bun run typecheck   # clean
bun run lint        # clean

Verified live on Windows 11: boot summary shows models_dir=C:\Users\<user>\models, and model listing + llama.cpp launch work end-to-end. Linux behavior is unchanged by construction: the non-win32 models default stays /models and os.tmpdir() returns /tmp.

Note: the controller test:unit suite currently has POSIX-only fixtures that fail when run on Windows (unrelated to this change — those are addressed in a separate test-portability PR); this branch touches only env.ts and log-files.ts and does not alter any test.

UI changes

None.

Risks / rollout notes

• Anyone who copied the .env.example LOCAL_STUDIO_MODELS_DIR=/models line verbatim must uncomment it to keep an explicit override; the in-code POSIX default is identical, so nothing changes on Linux/macOS unless that override was being relied upon.

[0xSero]

LGTM — the POSIX models-dir default stays literally /models by construction (the homelab relies on exactly that), and os.tmpdir() is the right call for the fallback log dir. One note for the record: on macOS os.tmpdir() returns $TMPDIR rather than /tmp, so the mac fallback log dir moves (self-consistent — old /tmp/vllm_*.log files just stop being listed); the "Linux behavior unchanged" claim is Linux-only, not all-POSIX. Dependency Review failure is our repo config, not this PR.

[github-actions]

🎉 This PR is included in version 1.65.2 🎉

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