fix: add MiniMax and Z.ai subscription params

[guillaumegay13]

Summary

• Preserve provider-native uppercase MiniMax model IDs and allow uppercase characters in model IDs.
• Correct existing MiniMax M2.7 subscription row casing and add missing MiniMax subscription rows for M2, M2.1, M2.1-highspeed, M2.5, and M2.5-highspeed.
• Add missing Z.ai subscription rows for glm-4.5, glm-4.6, and glm-5.
• Update schema docs and tests for provider-native casing.

Notes

• MiniMax official docs publish these language model IDs with MiniMax-* casing.
• Git may display two MiniMax YAML changes as high-similarity renames because the parameter rows are intentionally near-identical except for model IDs; the final tree contains the intended uppercase MiniMax files and no lowercase duplicates.

Validation

• npm run validate
• npm test
• npm run build
• npm run guard:params
• npm run typecheck
• npm run lint
• npx prettier --check on touched files
• git diff --check

[vercel]

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[guillaumegay13]

Superseded by same-repo PR #31 so Vercel can run without the fork authorization failure.