[codex] Add on-prem Ollama regression tests

[cazzek]

Summary

• add regression coverage for the native host Ollama path fixed in Fix/onprem host ollama pull #758
• verify reachable host Ollama uses the HTTP pull helper without touching Docker
• verify unreachable host Ollama falls back to the bundled container
• verify on-prem setup routes both Quick Setup models through the shared pull helper

Why

Issue #753 showed that on-prem setup could detect and reuse a healthy native Ollama instance, then still try to pull models through a Docker container that did not exist. The production fix is already present on main via #758, but the corrected dispatch behavior had no regression coverage.

Impact

Tests only. No runtime behavior changes.

Validation

• pytest tests/test_onprem_ollama.py -vv — 3 passed
• HOME=/tmp/memanto-test-home pytest --ignore=tests/test_e2e.py — 138 passed
• ruff check . — passed
• git diff --check — passed

Closes regression coverage gap for #753.

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