Add create-scenario command to clusteriohost

Creates a scenario directory with the Clusterio modules patched into it
so the modules can be used outside of Clusterio. The command reuses the
save patching by zipping the scenario, running patch() on it and
extracting the result. Defaults to the freeplay scenario from the
Factorio install in the host config and all plugins enabled there.

Module loading in Instance.prepareSave is moved to patch.loadModules so
the command and the instance share it, and findVersion is exported from
server.ts so the command can find the freeplay scenario.

Zipped scenarios were tried as an output form but Factorio does not
pick them up from the scenarios folder, so only directories are written.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

test/host/patch.js

@@ -226,6 +226,22 @@ describe("host/patch", function() {
 		});
 	});
 
+	describe("loadModules()", function() {
+		it("should load the bundled clusterio module", async function() {
+			const modules = await patch.loadModules([]);
+			assert.deepEqual([...modules.keys()], ["clusterio"]);
+			assert(modules.get("clusterio").files.has("modules/clusterio/api.lua"));
+		});
+		it("should load modules from plugins", async function() {
+			const pluginInfos = await lib.loadPluginInfos(
+				new Map([["research_sync", path.resolve("plugins/research_sync")]])
+			);
+			const modules = await patch.loadModules(pluginInfos);
+			assert.deepEqual([...modules.keys()], ["research_sync", "clusterio"]);
+			assert(modules.get("research_sync").files.has("modules/research_sync/sync.lua"));
+		});
+	});
+
 	describe("patch()", function() {
 		it("should throw on unknown scenario", async function() {
 			let zip = new JSZip();