- Just go through the gateway directly
- We'll need to update the mobile version eventually

- Clean up the SPA project (removed dead code)
- Fixed URLs in override file

* Clean up usings and controller attributes
- Removed redundant attributes when the controllers already specifies what the result type is.
- Use StatusCodes instead of HttpStatusCode.
- Clean up namespaces and use type aliases to disambiguate the many DTOs defined.

* Forgot one

* Update src/Services/Webhooks/Webhooks.API/Controllers/WebhooksController.cs

Co-authored-by: Reuben Bond <203839+ReubenBond@users.noreply.github.com>

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Co-authored-by: Reuben Bond <203839+ReubenBond@users.noreply.github.com>

Cache JsonSerializerOptions

According to https://github.com/dotnet/runtime/issues/65396, using a new JsonSerializerOptions every time JsonSerializer is invoked is a suboptimal pattern.

Fix this by caching JsonSerializerOptions instances.

Modernization

- The frontend hits the gateway which does the preflight request

- This avoids the extra process hop

- It will eventually replace envoy