feat(mcp): подготовить сервер и доступ к приёмке

tests/e2e/live-stream-fixture.ts

@@ -0,0 +1,35 @@
+import type { Page } from '@playwright/test'
+
+// Keep a response open; the browser test controls sample delivery independently of HTTP routes.
+export async function installOpenLiveStream(page: Page, path: string, sample: unknown, sendImmediately = true) {
+  await page.clock.install()
+  await page.addInitScript(({ path, sample, sendImmediately }) => {
+    const originalFetch = window.fetch.bind(window)
+    window.fetch = async (input, init) => {
+      const url = new URL(input instanceof Request ? input.url : String(input), location.href)
+      if (url.pathname !== path) return originalFetch(input, init)
+      const stream = new ReadableStream<Uint8Array>({
+        start(controller) {
+          const encode = (value: string) => new TextEncoder().encode(value)
+          const send = () => {
+            // A comment may precede an event; CRLF delimiters may cross chunks.
+            controller.enqueue(encode(': heartbeat\r\nevent: sample\r\ndata: ' + JSON.stringify(sample) + '\r\n\r'))
+            controller.enqueue(encode('\n'))
+          }
+          const heartbeat = () => controller.enqueue(encode(': heartbeat\r\n\r\n'))
+          Object.assign(window, { sendLiveSample: send, sendLiveHeartbeat: heartbeat })
+          if (sendImmediately) send()
+        },
+      })
+      return new Response(stream, { headers: { 'Content-Type': 'text/event-stream' } })
+    }
+  }, { path, sample, sendImmediately })
+}
+
+export async function resumeLiveStream(page: Page) {
+  await page.evaluate(() => (window as unknown as { sendLiveSample: () => void }).sendLiveSample())
+}
+
+export async function sendLiveHeartbeat(page: Page) {
+  await page.evaluate(() => (window as unknown as { sendLiveHeartbeat: () => void }).sendLiveHeartbeat())
+}