fix(minimax): mm@/mmax@ baseUrl minimax.io → minimaxi.com

[dev-seahouse]

Closes #121

Summary

• Corrects the default baseUrl for the minimax provider (mm@, mmax@) from https://api.minimax.io to https://api.minimaxi.com
• minimax.io is the endpoint for mmc@ (MiniMax Coding Plan) only — mm@/mmax@ should always route to minimaxi.com
• Updates all references: provider-definitions.ts, config-command.ts, README.md, docs/settings-reference.md, and affected tests

Root cause

BUILTIN_PROVIDERS in provider-definitions.ts had the wrong baseUrl for the minimax entry. The minimax-coding entry correctly used minimax.io, but minimax (the general provider) was pointing there too instead of minimaxi.com. This caused mm@ and mmax@ requests to hit the coding endpoint and get 401s.

Diff

 // provider-definitions.ts
 name: "minimax",
 transport: "anthropic",
-baseUrl: "https://api.minimax.io",
+baseUrl: "https://api.minimaxi.com",

 // model-catalog.test.ts — test now uses the correct base per key type
-const MINIMAX_API_BASE = "https://api.minimax.io/anthropic/v1/messages";
+const MINIMAX_API_BASE = MINIMAX_CODING_KEY
+  ? "https://api.minimax.io/anthropic/v1/messages"
+  : "https://api.minimaxi.com/anthropic/v1/messages";

Behavior change

Provider prefix	Before	After
mm@, mmax@	https://api.minimax.io (wrong)	https://api.minimaxi.com (correct)
mmc@	https://api.minimax.io	https://api.minimax.io (unchanged)

Test plan

• bun test packages/cli/src/providers/provider-definitions.test.ts — new tests assert minimax → minimaxi.com and minimax-coding → minimax.io
• bun test packages/cli/src/providers/transport/anthropic-compat.test.ts — updated fixture baseUrl passes
• Full repo bun test — exits 0 (no regressions)
• Manual: claudish --model mm@minimax-m2.7-highspeed --probe confirms transport uses minimaxi.com