Summary
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1. Pricing generation
• `model/pricing.go`: skip any model whose `status != 1` when building
`pricingMap`, ensuring disabled models are never returned to the
front-end.
2. Cache refresh placement
• `controller/model_meta.go`
– Removed `model.RefreshPricing()` from pure read handlers
(`GetAllModelsMeta`, `SearchModelsMeta`).
– Kept refresh only in mutating handlers
(`Create`, `Update`, `Delete`), guaranteeing data is updated
immediately after an admin change while avoiding redundant work
on every read.
Result
------
Front-end no longer receives information about disabled models, and
pricing cache refreshes occur exactly when model data is modified,
improving efficiency and consistency.
