Frontend uudelleenrakennettu: Astro-komponentit, Wasm pääsäikeessä, ei Workeria

Vanha frontend siirretty temp/. Uusi rakenne:
- StatusBar.astro, Terminal.astro, Editor.astro, Guide.astro
- global.css erillinen
- Wasm pääsäikeessä (ei Worker — yksinkertainen, debugattava)
- Tab-completion, dropdown, projektikortti, Monaco, GUIDE.md
- Ei tokenisointia eikä koodilaboratoriota

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

network-poc/frontend/node_modules/astro/dist/vite-plugin-astro-server/route-guard.js

@@ -0,0 +1,58 @@
+import * as fs from "node:fs";
+import { notFoundTemplate } from "../template/4xx.js";
+import { writeHtmlResponse } from "./response.js";
+const VITE_INTERNAL_PREFIXES = [
+  "/@vite/",
+  "/@fs/",
+  "/@id/",
+  "/__vite",
+  "/@react-refresh",
+  "/node_modules/",
+  "/.astro/"
+];
+function routeGuardMiddleware(settings) {
+  const { config } = settings;
+  return function devRouteGuard(req, res, next) {
+    const url = req.url;
+    if (!url) {
+      return next();
+    }
+    const accept = req.headers.accept || "";
+    if (!accept.includes("text/html")) {
+      return next();
+    }
+    let pathname;
+    try {
+      pathname = decodeURI(new URL(url, "http://localhost").pathname);
+    } catch {
+      return next();
+    }
+    if (VITE_INTERNAL_PREFIXES.some((prefix) => pathname.startsWith(prefix))) {
+      return next();
+    }
+    if (url.includes("?")) {
+      return next();
+    }
+    const publicFilePath = new URL("." + pathname, config.publicDir);
+    if (fs.existsSync(publicFilePath)) {
+      return next();
+    }
+    const srcFilePath = new URL("." + pathname, config.srcDir);
+    if (fs.existsSync(srcFilePath)) {
+      return next();
+    }
+    const rootFilePath = new URL("." + pathname, config.root);
+    try {
+      const stat = fs.statSync(rootFilePath);
+      if (stat.isFile()) {
+        const html = notFoundTemplate(pathname);
+        return writeHtmlResponse(res, 404, html);
+      }
+    } catch {
+    }
+    return next();
+  };
+}
+export {
+  routeGuardMiddleware
+};