Live-probed against real free-tier keys on 2026-04-25. Adds 8 models
that returned 200 with content, drops the one OR :free route that
404s, and corrects two Google rate-limits whose catalog values were
~10x-50x too high.

Adds:
- Cloudflare: @cf/moonshotai/kimi-k2.5, @cf/qwen/qwen3-30b-a3b-fp8,
  @cf/deepseek-ai/deepseek-r1-distill-qwen-32b
- Google preview: gemini-3-flash-preview, gemini-3.1-flash-lite-preview,
  gemini-3.1-pro-preview (Pro confirmed free-tier-eligible by the
  free_tier_requests quota metric in 429 errors)
- OpenRouter: google/gemma-4-31b-it:free, liquid/lfm-2.5-1.2b-instruct:free

Removes:
- openrouter/arcee-ai/trinity-large-preview:free (404 No endpoints found)

Corrects:
- gemini-2.5-flash and gemini-2.5-flash-lite RPD 250/1000 -> 20.
  Free tier now uniformly enforces 20 RPD per model per project.

Updates router test rationale: gemini-3.1-pro-preview at rank 1 now
outranks Groq's gpt-oss-120b (rank 6) when keys exist for both.