* feat(models): add deepseek-v4-flash to OpenRouter + Nous curated lists
deepseek/deepseek-v4-flash was already in the native deepseek provider
catalog but missing from the curated OpenRouter and Nous Portal picker
lists. Added it to both and regenerated the model-catalog.json manifest
(drift guard requires same-PR regeneration).
* refactor(models): trim redundant variants, group curated lists by maker
Remove claude-opus-4.7/4.6, gpt-5.4-nano, gpt-5.3-codex,
gemini-3-pro-image-preview, gemini-3.1-flash-lite-preview, grok-4.20,
and the older gemini-3-pro-preview (Nous). Reorder both OPENROUTER_MODELS
and _PROVIDER_MODELS[nous] into contiguous per-maker blocks with comment
headers. Regenerated model-catalog.json (openrouter 27, nous 20).
* feat(models): add gemini-3-pro-preview to OpenRouter + Nous curated lists
Adds google/gemini-3-pro-preview to both curated pickers (new on
OpenRouter, restored on Nous). Regenerated model-catalog.json
(openrouter 28, nous 21).
* test(models): use claude-opus-4.8 in OpenRouter fetch fixtures
The two TestFetchOpenRouterModels tests mocked a live OpenRouter
response with claude-opus-4.6 and relied on it surviving the curated-list
filter. Since 4.6 was removed from OPENROUTER_MODELS, those models got
filtered out and the recommended tag shifted. Swap the fixture to
claude-opus-4.8 (still curated, still first in the Anthropic block).
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