feat(ugc): settings for the ray tracer, hidden-face method and denoising

New UGC settings (ugcconfig.ini and the dashboard's settings page):

- ray_backend: builtin (default), embree or hiprt (falls back to embree when
  the build or machine can't); the hidden faces' paths and the occlusion rays
- hsr_method: toolbox (default, LU Toolbox's paths) or fast (the renders from
  around the model), and hsr_fast_resolution (1024) for the fast one
- denoise: off (default) or oidn (icons; off until a build has it)

UgcProcessOptions (dCommon/UgcKeys.h) names the choices for everything that
passes them on ("embree fast oidn", any order, left out: the setting's).
UgcJobs::ApplyOptions puts a choice over the settings and MadeWith says what a
make used after fallbacks; a made model's stats.json records it (rays,
hsrMethod, denoise). UgcServer --make-model and --make-modular take the
choices after the folder and print the CPU time and what made it.

Check: the defaults make the same files as before; the settings page shows the
four settings under UGC; UgcServer --make-model model.lxfml out embree fast.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

dUgcServer/Render/UgcRender.cpp

@@ -94,6 +94,21 @@ namespace {
 }
 
 namespace UgcRender {
+	std::string_view Name(eDenoise denoise) {
+		return denoise == eDenoise::OIDN ? "oidn" : "off";
+	}
+
+	std::optional<eDenoise> ParseDenoise(std::string_view name) {
+		for (const auto denoise : { eDenoise::OFF, eDenoise::OIDN }) {
+			if (Name(denoise) == name) return denoise;
+		}
+		return std::nullopt;
+	}
+
+	bool Available(eDenoise denoise) {
+		return denoise == eDenoise::OFF;
+	}
+
 	std::vector<glm::vec3> SphereDirections() {
 		const float t = (1.0f + std::sqrt(5.0f)) / 2.0f;
 		const std::vector<glm::vec3> corners = {