整合求解器活动监控与步长回归证据

同步远端 PNL0003 诊断和大采样网格能力，语义合并活动感知的 60 秒真停滞判定与旧后端 15 分钟兼容兜底。

纳管热路径优化、15 单元运行证据、浏览器与 API 报告，并补充北京时间更新日志和遗留问题。

frontend/playwright.live.config.ts

@@ -0,0 +1,59 @@
+import { defineConfig } from "@playwright/test";
+import { fileURLToPath } from "node:url";
+
+const channel = process.env.PLAYWRIGHT_CHANNEL?.trim();
+const executablePath = process.env.PLAYWRIGHT_EXECUTABLE_PATH?.trim();
+const frontendRoot = fileURLToPath(new URL(".", import.meta.url));
+const repositoryRoot = fileURLToPath(new URL("..", import.meta.url));
+const simulationEnvironment = {
+  ...process.env,
+  SIMULATION_CAUSAL_EXECUTOR_V2: "1",
+  SIMULATION_CAUSAL_COORDINATE_KERNEL: "1",
+  SIMULATION_CAUSAL_DIRECT_SUM_ASSIGNMENTS: "1",
+  SIMULATION_CAUSAL_DIRECT_EQUATION_READERS: "1",
+  SIMULATION_CAUSAL_FAST_PATH: "1",
+  SIMULATION_MECHANICAL_ATOL_MODE: "legacy",
+  SIMULATION_ODE_JACOBIAN_MODE: "scipy",
+  SIMULATIONAPP_PROPERTY_CACHE: "on",
+};
+
+export default defineConfig({
+  testDir: "./tests/e2e",
+  fullyParallel: false,
+  workers: 1,
+  timeout: 600_000,
+  expect: {
+    timeout: 15_000,
+  },
+  outputDir: "test-results/live-mql8",
+  use: {
+    baseURL: "http://127.0.0.1:14173",
+    ...(channel ? { channel } : {}),
+    ...(executablePath ? { launchOptions: { executablePath } } : {}),
+    headless: true,
+    viewport: { width: 1440, height: 900 },
+    screenshot: "only-on-failure",
+    trace: "on",
+  },
+  webServer: [
+    {
+      command:
+        ".venv/bin/python -m uvicorn app.main:app --host 127.0.0.1 --port 18181",
+      cwd: repositoryRoot,
+      env: simulationEnvironment,
+      url: "http://127.0.0.1:18181/api/components/catalog",
+      reuseExistingServer: false,
+      timeout: 120_000,
+      gracefulShutdown: { signal: "SIGTERM", timeout: 10_000 },
+    },
+    {
+      command:
+        "node --input-type=module -e \"import { createServer } from 'vite'; import react from '@vitejs/plugin-react'; const server = await createServer({ configFile: false, root: process.cwd(), plugins: [react()], server: { host: '127.0.0.1', port: 14173, strictPort: true, proxy: { '/api': 'http://127.0.0.1:18181' } } }); await server.listen();\"",
+      cwd: frontendRoot,
+      url: "http://127.0.0.1:14173",
+      reuseExistingServer: false,
+      timeout: 120_000,
+      gracefulShutdown: { signal: "SIGTERM", timeout: 10_000 },
+    },
+  ],
+});