fix: correct MiniMax M2.5 pricing (was ~50x too high) (openclaw#22755) thanks @miloudbelarebia

Verified:
- pnpm build
- pnpm check
- pnpm test:macmini

Co-authored-by: miloudbelarebia <136994453+miloudbelarebia@users.noreply.github.com>
Co-authored-by: Tak Hoffman <781889+Takhoffman@users.noreply.github.com>

src/commands/onboard-auth.models.ts

@@ -42,12 +42,12 @@ export function resolveZaiBaseUrl(endpoint?: string): string {
   }
 }
 
-// Pricing: MiniMax doesn't publish public rates. Override in models.json for accurate costs.
+// Pricing per 1M tokens (USD) — https://platform.minimaxi.com/document/Price
 export const MINIMAX_API_COST = {
-  input: 15,
-  output: 60,
-  cacheRead: 2,
-  cacheWrite: 10,
+  input: 0.3,
+  output: 1.2,
+  cacheRead: 0.03,
+  cacheWrite: 0.12,
 };
 export const MINIMAX_HOSTED_COST = {
   input: 0,