Refactor OpenAPI spec: deduplicate into shared components

[devin-ai-integration]

Summary

Eliminates pervasive duplication in the BankWeb OpenAPI spec by extracting repeated patterns into reusable components/ definitions. Net reduction: 123 lines (1211 → 1088), replacing 356 lines of inline duplication with 233 lines of shared definitions.

Shared responses (components/responses/)

• UnauthorizedResponse — replaces 16 inline 401 blocks
• BadRequestResponse — replaces 13 inline 400 blocks
• EmptyResultResponse — replaces 9 inline 200 + EmptyResult blocks
• StoreItemListResponse — shared by AdminStore/GetStoreItems and Store/GetStoreItems
• NotFoundResponse — replaces inline 404 block

Shared request bodies (components/requestBodies/)

• UserModelBody — used by 5 endpoints (Login, Register, PasswordRecovery, Recover, ContactUs)
• StoreItemBody — used by 3 endpoints (Create, Edit, DeleteStoreItem)
• BuyProductReqBody, TransactionDBModelBody, NewImageModelBody

Each eliminates the repeated application/json + text/json + application/*+json content-type triplet.

Shared parameter (components/parameters/)

• PathId — {id} path param shared by AdminStore/Get/{id}, AdminStore/Edit/{id}, Transaction/Get/{id}

Schema consolidation

+DataTableResp           // base: { recordsTotal, recordsFiltered }
  TransactionRespDataTableResp    // allOf: DataTableResp + { data: TransactionResp[] }
  AdminUserInfoRespDataTableResp  // allOf: DataTableResp + { data: AdminUserInfoResp[] }

Previously these two schemas duplicated the recordsTotal/recordsFiltered wrapper; now they compose via allOf from a shared DataTableResp base.

Link to Devin session: https://app.devin.ai/sessions/e02d6a21c64e466aa756e4f36c06d313
Requested by: @wsh92

[devin-ai-integration]

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