Add separate MiniMax quota providers for minimax.io and minimaxi.com
Register and export both MiniMax providers in the web quota dispatcher
Update UI quota provider types/list and quota module documentation
* refactor(quota): migrate server quota providers to modular registry architecture
* docs: add quota module documentation
Explain the quota module purpose and runtime signals.
List entrypoints, provider registry, and response shape.
Outline steps to add a new provider and testing commands.
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