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Add comprehensive unit test coverage for DNS-over-gRPC and DNS-over-QUIC server implementations: - server_grpc_test.go: Tests gRPC server creation, TLS config, lifecycle methods, Query handling, and response writer - server_quic_test.go: Tests QUIC server creation, custom limits, message validation, DOQ message parsing, and writer interface Tests focus on component-level validation with mocks, complementing existing integration tests without overlap. Signed-off-by: Ville Vesilehto <ville@vesilehto.fi>