fix(test): fill in mi.url/app.id before booting the scaffolded dev server

pp-dev 1.0 hard-fails startup when mi.url is missing and mi.mode is
"embedding" or app.type is "template" (both true for template-vanilla's
default config). The dev-server e2e test scaffolds the template as-is and
was hitting this validation error instead of a healthy dev server.

Patch the placeholder values in before running `npm run dev`, same as a real
user would before their first run.

Author: sergak01

test/scaffold.spec.mjs

@@ -273,6 +273,18 @@ test('runs dev server for scaffolded vanilla project', async () => {
 
   expect(scaffold.status, `stderr: ${scaffold.stderr}\nstdout: ${scaffold.stdout}`).toBe(0);
 
+  // pp-dev 1.0 requires mi.url whenever mi.mode is "embedding" or app.type is "template" — fill in
+  // the placeholder the template ships commented out, same as a user would before their first `dev`.
+  const configPath = path.join(targetDir, 'pp-dev.config.js');
+  const configSource = fs.readFileSync(configPath, 'utf8');
+
+  fs.writeFileSync(
+    configPath,
+    configSource
+      .replace("// url: 'https://example.metricinsights.com',", "url: 'https://example.metricinsights.com',")
+      .replace('// id: 1,', 'id: 1,'),
+  );
+
   const install = runNpmSync(['install', '--no-audit', '--fund=false'], {
     cwd: targetDir,
     encoding: 'utf8',