.NET 10 & Minimal API Support

[engineering87]

This PR introduces .NET 10 support, Minimal API integration via a new endpoint filter, hardened event processing, and significantly expanded test coverage.

⚠️ Breaking Changes

• Target framework upgraded to .NET 10: all consuming projects must target .NET 10 or later.
• Enqueue(WartEventWithFilters) now throws InvalidOperationException when writing to a completed channel instead of returning false.

✨ New Features

• Minimal API support: New WartEndpointFilter and WartEndpointExtensions for intercepting HTTP requests in Minimal API pipelines.
• WART-MinimalApi sample project: Demonstrates endpoint filter integration with sample endpoints.

🐛 Bug Fixes

• WartEventQueueService: IsEmpty uses TryPeek(out WartEventWithFilters) to reduce race conditions in concurrent scenarios.
• WartEventWorker: Hardened edge case handling during event processing.
• JWT authentication: Fixed null reference in LifetimeValidator for tokens without exp claim.
• JsonArrayOrObjectStringConverter: Improved serialization robustness.

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