feat: add module backend assignment support (#1500)

Co-authored-by: Stéphane du Hamel <stephduh@live.fr>

examples/cli/main.cpp

@@ -749,7 +749,9 @@ int main(int argc, const char* argv[]) {
                                                      ctx_params.offload_params_to_cpu,
                                                      ctx_params.diffusion_conv_direct,
                                                      ctx_params.n_threads,
-                                                     gen_params.upscale_tile_size));
+                                                     gen_params.upscale_tile_size,
+                                                     ctx_params.backend.c_str(),
+                                                     ctx_params.params_backend.c_str()));
 
         if (upscaler_ctx == nullptr) {
             LOG_ERROR("new_upscaler_ctx failed");