支持真实G代码程序执行

结论：AXIS 风格浏览器仿真页面新增 Open Program、runProgramText 和 loadProgramFile，支持用户提供的 G-code 文本/文件通过 LinuxCNC WASM 执行并参与回放。

wasm-port/tests/ui/node/verify_real_simulation_programs.mjs

@@ -12,6 +12,7 @@ import {
   getSimulationTestProgram,
   getSimulationTestPrograms,
   parseLinuxCncCanonicalMotion,
+  runRealBrowserSimulation,
 } from "../../../runtime/ui/simulation/simulation-app.js";
 import {
   SIMULATION_TEST_PROGRAMS as directoryPrograms,
@@ -119,4 +120,18 @@ const clampedFrame = createPlaybackFrame(playbackState, 99);
 assert.equal(clampedFrame.index, 2);
 assert.equal(clampedFrame.progress, 100);
 
+const customRunDocument = {
+  body: { dataset: {} },
+  querySelector: () => null,
+  querySelectorAll: () => [],
+};
+const customRun = await runRealBrowserSimulation({
+  documentRef: customRunDocument,
+  programText: "G90 G17 G0 X0 Y0 Z0\nG1 X4.25 Y2.5 F90\nM2\n",
+});
+assert.equal(customRun.program.id, "custom");
+assert.equal(customRun.program.source, "custom");
+assert.ok(customRun.resultText.includes("canon_event=STRAIGHT_FEED line=2 x=4.25 y=2.5"));
+assert.ok(customRun.summary.ready);
+
 console.log("real_simulation_programs_node_smoke=ok");