Replace Python numerical kernels with native C execution

frontend/tests/e2e/native-result.spec.ts

@@ -0,0 +1,42 @@
+import { expect, test } from "@playwright/test";
+import { expandSimulationConsole, prepareApp, resultSnapshot, wideProject } from "./fixtures";
+
+for (const diagnosticsMode of ["native", "legacy-native", "python"] as const) {
+  test(`completed ${diagnosticsMode} results can be published and restored`, async ({ page }) => {
+    await prepareApp(page);
+    const diagnostics = diagnosticsMode === "python"
+      ? resultSnapshot.result.diagnostics
+      : { backend: "native-c", stateCount: 1,
+          ...(diagnosticsMode === "native" ? { sampleCount: 3 } : {}) };
+    await page.route("**/api/system-xml/simulate-stream", route => route.fulfill({
+      contentType: "application/x-ndjson",
+      body: JSON.stringify({ event: "result", progress: 100, phase: "completed",
+        result: { ...resultSnapshot.result, diagnostics } }) + "\n",
+    }));
+    await page.goto("/");
+    await page.locator('input[type="file"]').setInputFiles({
+      name: "native-result.json", mimeType: "application/json",
+      buffer: Buffer.from(JSON.stringify({ ...wideProject, edges: [...wideProject.edges, {
+        id: "close-test-loop", source: "generic_sensor_4", target: "generic_sensor_1",
+        sourceHandle: "port_b", targetHandle: "port_a", data: { isContactEdge: false },
+      }] })),
+    });
+    await expect(page.getByRole("textbox", { name: "工程", exact: true })).toHaveValue(wideProject.name);
+    await page.getByRole("button", { name: "运行仿真", exact: true }).click();
+    await expandSimulationConsole(page);
+    const consolePanel = page.getByRole("complementary", { name: "仿真控制台", exact: true });
+    await expect(consolePanel).toContainText("仿真完成，已生成新的结果，共 3 个采样点");
+    await expect(consolePanel).not.toContainText("仿真失败");
+    if (diagnosticsMode === "python") {
+      await expect(consolePanel).toContainText("最大方程残差 0");
+    } else {
+      await expect(consolePanel).not.toContainText("最大方程残差");
+    }
+    const saved = await page.evaluate(() => JSON.parse(sessionStorage.getItem("system-simulation-flow:latest-result") ?? "null"));
+    expect(saved.result.diagnostics.sampleCount).toBe(3);
+    expect(saved.result.series).toEqual(resultSnapshot.result.series);
+    await page.reload();
+    await page.getByRole("tab", { name: "结果", exact: true }).click();
+    await expect(page.getByText("3 个采样点", { exact: false }).first()).toBeVisible();
+  });
+}