Merge branch 'upstream' into concedo_experimental

# Conflicts:
#	ggml/src/ggml-opencl/ggml-opencl.cpp
#	ggml/src/ggml-sycl/ggml-sycl.cpp
#	requirements/requirements-convert_hf_to_gguf_update.txt
#	scripts/compare-llama-bench.py
#	tests/test-backend-ops.cpp
#	tests/test-chat.cpp
#	tools/imatrix/README.md
#	tools/imatrix/imatrix.cpp
#	tools/llama-bench/llama-bench.cpp

tools/server/server.cpp

@@ -4249,9 +4249,6 @@ int main(int argc, char ** argv) {
 
             // process prompt
             std::vector<server_tokens> inputs;
-            if (oaicompat && !prompt.is_string()) {
-                throw std::runtime_error("prompt must be a string");
-            }
 
             if (oaicompat && has_mtmd) {
                 // multimodal