feat/api middleware

[scheidtdav]

This PR adds middleware to two endpoints as examples:

• jsonResponseHeaders: Adds content-type headers to all response
• jwtAuth: Finds and extracts the jwt from a request to check if there is a valid user authentication. The user is provided in the context for endpoints to be used.

Overall, with middleware being an unstable feature still, it seems to be a bit tricky to get the right typings for it..
A bit annoying but powerful.

The tests need to be adjusted a bit to make use of the middleware, because the current scheme only runs the loader/action functions directly, skipping over the middleware. Technically thats the better unit test and middleware functions could be tested separately. I think I prefer that, what do you think?

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	@​react-router/​serve@​7.6.1 ⏵ 7.8.0
	@​react-router/​express@​7.6.1 ⏵ 7.8.0
	@​react-router/​fs-routes@​7.6.1 ⏵ 7.8.0
	@​react-router/​node@​7.6.1 ⏵ 7.8.0	+1
	@​react-router/​dev@​7.6.1 ⏵ 7.8.0			+1
	@​vitejs/​plugin-react@​4.3.4 ⏵ 4.7.0

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