Application.temporaryCachePath can only be called from the main thread

[Draco18s]

Describe the bug

public static async Task<string> Download(string url, bool lora = false, bool log = false, string label = null)
{
	//...
	string tmpPath = Path.Combine(tempCache, Path.GetFileName(savePath));

If this method is called on a child thread for any reason (say, I want to manage the models in the runtime and not from the editor)...

	Task t = Task.Run(async () =>
	{
		_ = await LLMManager.DownloadModel(opt.url, false, opt.text.Trim());
	});

The temp cache path will error out with a message that it can only be called from the main thread. Caching this value as a static field resolves.

Steps to reproduce

No response

LLMUnity version

No response

Operating System

None

[Draco18s]

Similarly this will fail during runtime in the editor.

#if UNITY_EDITOR
                AssetDatabase.StartAssetEditing();
#endif
                Directory.CreateDirectory(Path.GetDirectoryName(savePath));
                if (File.Exists(savePath)) File.Delete(savePath);
                File.Move(tmpPath, savePath);
#if UNITY_EDITOR
                AssetDatabase.StopAssetEditing();
#endif

StartAssetEditing can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.

Should include if(!Application.isPlaying) as well.

Oh FFS Unity, that has to be main thread too? Bah!

Oh and one last one:
LLM should use Start instead of Awake, so that it can be instantiated as-needed (can't call SetModel on it until it's been created, but it will error out if it runs Awake and doesn't have a model).
eg:

			selectedModel ??= drop.options[drop.value] as ModelOption;
			string filename = Path.GetFileName(selectedModel.url);
			ModelEntry entryPath = LLMManager.Get(filename);
			if (entryPath == null) return false;
			llmInstance ??= gameObject.AddComponent<LLMCharacter>();
			llmInstance.llm ??= gameObject.AddComponent<LLM>();
			llmInstance.llm.numGPULayers = 2;
			string p = LLM.GetLLMManagerAsset(entryPath.filename);
			llmInstance.llm.SetModel(entryPath.filename);