Custom API aggregators (New API, One API, etc.) route requests using their
own naming conventions — bare names like ``deepseek-v4-flash`` or dot-separated
names like ``moonshotai.kimi-k2.5`` — rather than the OpenRouter-style
``vendor/model`` slash format that ``_heuristic_reasoning_efforts``'s prefix
list was written for.
Because none of these names match the slash-prefixed patterns, the function
returned ``[]``, hiding the reasoning effort selector in the WebUI even for
models that fully support thinking/reasoning.
Fix: add a secondary check in ``_heuristic_reasoning_efforts`` that strips an
optional dot-vendor prefix and matches the remaining model name against a list
of known thinking-capable bare-name prefixes (``deepseek-v4``, ``deepseek-r1``,
``kimi-k2``, ``qwen3``, ``claude-3/4``, ``o1/o3/o4``), plus a keyword catch
for model names containing ``thinking`` or ``reasoning``.
The slash-prefix path and all provider-specific fast paths (copilot, lmstudio,
models.dev metadata) are unchanged; this block only runs as a final fallback.
Regression tests added in ``tests/test_custom_provider_bare_model_reasoning.py``.
b3nw