teernisse 5efe7581ed Add Publix API client for savings and store location endpoints ...

HTTP client that wraps the Publix services API with two endpoints:
- /api/v4/savings — fetches weekly ad deals for a given store number
- /api/v1/storelocation — finds nearby stores by ZIP code

Includes request types (SavingsResponse, SavingItem, StoreResponse,
Store) mapping directly to the Publix JSON schema. The client sends
a PublixStore header for store-scoped requests and uses a 15-second
timeout. Tests use httptest servers to verify header propagation,
JSON decoding, and error handling for non-200 responses.

2026-02-22 21:41:39 -05:00

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