fix(presets): drop MiniMax from ultra-cheap (avoid trial deadline)

[Destynova2]

Summary

MiniMax's free trial expires 2026-11-07 — six months from now this preset would silently break for new installs that picked it up after the trial ended. Removing the provider entirely is cleaner than baking in a time-bomb.

What's removed

• [[providers]] name = "minimax" block (api.minimaxi.com)
• MiniMax-M2.5 mapping at default-model priority 3
• "minimax" entry in complex (>100K input) and medium (>7K input) tier provider lists
• All MiniMax mentions from doc preamble: header description, free-tier table, account requirements section, strategy section, source URLs

What stays

• 4 ongoing free tiers (no expiry concerns):
  • Groq — 30 RPM, 1 000 RPD, 6K TPM
  • Cerebras — 1M tok/day, 8K context cap on free
  • Z.ai GLM — ongoing free GLM-4.7-Flash + GLM-4.5-Flash
  • OpenRouter :free — 50 RPD base / 1 000 RPD with $10 lifetime
• 2 signup-bonus sources (these don't go dark after bonus — they keep working as paid):
  • DeepSeek — 5M tokens / 30 days, then $0.14/$0.28 V4 Flash
  • Inception Mercury — 10M tokens / 30 days, then varies
• xAI Grok 4.1 Fast for web search + long context (paid only, $0.20/$0.50)

Why MiniMax was different

DeepSeek and Mercury have signup bonuses with 30-day expiry. After the bonus burns, the API keeps working — it just bills at pay-as-you-go rates. Both are still useful as paid providers (DeepSeek V4 Flash at $0.14/$0.28 is among the cheapest decent code models on the market).

MiniMax was a trial period — meaning when the deadline hits, the free terms end entirely and the future pricing is unclear. That's a contract gap, not a budget cap.

Provider count

Drops from 10 to 9 (7 enabled by default, 2 opt-in: Gemini for those OK with training data, Nebius for paid floor).

Test plan

• grob preset info ultra-cheap — parses, 9 providers, 5 models, all router slots wired
• grep -E 'minimax|MiniMax|2026-11' presets/ultra-cheap.toml returns nothing
• No hardcoded version strings (CI guard)
• Docs lint passes in CI

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