Implemented logic to retrieve materials based on a model string and verify if the resulting set is complete.
Added:
- `GetValidMaterialsByModel`: Parses the model, extracts conditions, and matches materials against root categories.
- `CheckCategoryCompleteness`: Recursively validates categories to ensure exactly one material match per required category (leaf or parent).
This enables the BOM Manager to return a collection of materials alongside a boolean flag indicating if the collection satisfies the structural completeness rules.
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