feat: Pick exception renderer based on the request's Accept header

[stephanschuler]

No description provided.

[Copilot]

Pull request overview

This PR introduces Accept-header-driven exception handling for the Netlogix.WebApi package. A new PSR-15 middleware catches throwables thrown by downstream middlewares (so wrapping middlewares like Sitegeist.OffCORS:CorsMiddleware still see a real response) and delegates rendering to a dispatcher that picks a Flow ExceptionHandlerInterface implementation based on the request's Accept header. A JSON exception handler that matches the existing JsonViewHelper output shape is shipped, alongside default configuration plus a Development override.

Changes:

• New ExceptionToResponseMiddleware registered after Sitegeist.OffCORS:CorsMiddleware, plus AcceptHeaderDependingExceptionHandler doing content negotiation and adapting header()/echo-style handlers to a PSR-7 response.
• New JsonExceptionHandler rendering throwables as JSON (using JsonSerializable when available, otherwise a generic status/reference payload).
• Settings for availableErrorHandlers with JSON media-type entries and a * fallback (ProductionExceptionHandler in default, DebugExceptionHandler in Development) and README docs.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
README.md	Documents the new middleware, dispatcher, JSON handler, and configuration.
Configuration/Settings.Middleware.yaml	Registers ExceptionToResponseMiddleware directly after Sitegeist.OffCORS:CorsMiddleware.
Configuration/Settings.ExceptionHandler.yaml	Declares availableErrorHandlers per media type with JSON handlers and a ProductionExceptionHandler fallback.
Configuration/Development/Settings.ExceptionHandler.yaml	Overrides the * fallback with DebugExceptionHandler in Development.
Classes/Http/Middleware/ExceptionToResponseMiddleware.php	PSR-15 middleware that catches throwables and delegates to the dispatcher.
Classes/Error/AcceptHeaderDependingExceptionHandler.php	Negotiates an Accept-matching handler, captures its emitted headers/body, and returns a PSR-7 response.
Classes/Error/JsonExceptionHandler.php	Flow ExceptionHandlerInterface implementation emitting JSON error payloads.

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