Give the web app a title, a robots.txt and keep pages behind the login out of search

src/Schuly.Frontend/public/robots.txt

@@ -0,0 +1,6 @@
+User-agent: *
+Allow: /login
+Allow: /register
+Disallow: /
+
+Sitemap: https://schuly.dev/sitemap.xml

src/Schuly.Frontend/src/app/app.ts

@@ -1,7 +1,11 @@
-import { Component } from '@angular/core';
-import { RouterOutlet } from '@angular/router';
+import { Component, inject } from '@angular/core';
+import { Meta } from '@angular/platform-browser';
+import { NavigationEnd, Router, RouterOutlet } from '@angular/router';
 import { HlmToasterImports } from '@spartan-ng/helm/sonner';
 
+// Only the sign-in and register pages may show up in search; everything else is behind a login or a one-off link.
+const INDEXABLE = new Set(['/login', '/register']);
+
 @Component({
   selector: 'app-root',
   imports: [RouterOutlet, HlmToasterImports],
@@ -10,4 +14,13 @@ import { HlmToasterImports } from '@spartan-ng/helm/sonner';
     <hlm-toaster />
   `,
 })
-export class App {}
+export class App {
+  constructor() {
+    const meta = inject(Meta);
+    inject(Router).events.subscribe((e) => {
+      if (!(e instanceof NavigationEnd)) return;
+      const path = e.urlAfterRedirects.split(/[?#]/)[0];
+      meta.updateTag({ name: 'robots', content: INDEXABLE.has(path) ? 'index, follow' : 'noindex, nofollow' });
+    });
+  }
+}

src/Schuly.Frontend/src/index.html

@@ -2,7 +2,8 @@
 <html lang="de">
 <head>
   <meta charset="utf-8">
-  <title>Schuly</title>
+  <title>Schuly – Web-App</title>
+  <meta name="description" content="Melde dich bei Schuly an: Noten, Absenzen, Stundenplan und mehr im Browser.">
   <base href="/">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <meta name="color-scheme" content="light dark">