TekH 50c02314ef Add SignatureCacheService for managing cached signatures
Introduced a new `SignatureCacheService` class to handle
cached signatures via API interactions. This includes methods
for saving, retrieving, and deleting signatures using `HttpClient`.

- Added dependency injection for `HttpClient` and `IOptions<ApiOptions>`.
- Implemented `SaveSignatureAsync`, `GetSignatureAsync`, and
  `DeleteSignatureAsync` methods with error handling.
- Utilized `Uri.EscapeDataString` for safe URL encoding.
- Added support for HTTP operations with `System.Net.Http.Json`.
2026-06-09 09:50:50 +02:00
2025-03-28 15:12:26 +01:00
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