Adds a new API call (`getAllStockPiking`) to retrieve stock picking records from the backend.
Refactors stock picking data models:
- Renames models for better clarity (e.g., `StockPickingResponse` to `StockPickingResponseModel`).
- Makes all model fields nullable to handle varying API responses gracefully.
- Introduces specific nested models (`StockPickingCompanyModel`, `StockPickingPartnerModel`, `StockPickingLocationModel`, `StockPickingTypeModel`) for related entities, enhancing type safety and data structure.
Integrates the new API call into `ReceptionPageModel` and introduces distinct loading states (`loadingUser`, `loadingReceptions`) for improved UI feedback.
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