feat: Add health check endpoint, SEO meta tags, and sitemap/robots support for improved site visibility and functionality

Co-authored-by: Copilot <copilot@github.com>

Website/main.py

@@ -1615,6 +1615,47 @@ def default():
     return render_template("main.html")
 
 
+@app.route('/health')
+def health():
+    return jsonify({"status": "ok", "time": _utc_now_iso()}), 200
+
+
+@app.route('/robots.txt')
+def robots_txt():
+    path = os.path.join(BASE_DIR, 'static', 'robots.txt')
+    if os.path.exists(path):
+        return send_file(path, mimetype='text/plain')
+    return (
+        "User-agent: *\nDisallow: /admin/\nAllow: /\nSitemap: /sitemap.xml\n",
+        200,
+        {"Content-Type": "text/plain"},
+    )
+
+
+@app.route('/sitemap.xml')
+def sitemap_xml():
+    site_root = request.url_root.rstrip('/')
+    sitemap_path = os.path.join(BASE_DIR, 'static', 'sitemap.xml')
+    if os.path.exists(sitemap_path):
+        try:
+            with open(sitemap_path, 'r', encoding='utf-8') as fh:
+                content = fh.read().replace('{{ SITE_ROOT }}', site_root)
+            return app.response_class(content, mimetype='application/xml')
+        except Exception:
+            pass
+    xml = (
+        '<?xml version="1.0" encoding="UTF-8"?>\n'
+        '<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">\n'
+        '  <url>\n'
+        f'    <loc>{site_root}</loc>\n'
+        '    <changefreq>daily</changefreq>\n'
+        '    <priority>1.0</priority>\n'
+        '  </url>\n'
+        '</urlset>'
+    )
+    return app.response_class(xml, mimetype='application/xml')
+
+
 @app.route('/dienstleistungen')
 def dienstleistungen():
     return render_template("dienstleistungen.html")

Website/static/robots.txt

@@ -0,0 +1,5 @@
+User-agent: *
+Disallow: /admin/
+Disallow: /static/uploads/
+Allow: /
+Sitemap: /sitemap.xml

Website/static/sitemap.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
+  <url>
+    <loc>{{ SITE_ROOT }}</loc>
+    <changefreq>daily</changefreq>
+    <priority>1.0</priority>
+  </url>
+</urlset>

Website/templates/base.html

@@ -8,6 +8,20 @@
     <meta name="apple-mobile-web-app-capable" content="yes">
     <meta name="apple-mobile-web-app-status-bar-style" content="black-translucent">
     <title>{% block title %}Digitale Schulverwaltung{% endblock %}</title>
+    {# Basic SEO meta tags, can be overridden per-template by setting `meta_description` #}
+    <meta name="description" content="{{ meta_description|default('Invario — Lehrmittel-, Inventar- und Ausleihverwaltung für Schulen. Sicher, einfach, nachvollziehbar.') }}">
+    <link rel="canonical" href="{{ request.url_root.rstrip('/') }}{{ request.path }}">
+    <!-- OpenGraph / Twitter -->
+    <meta property="og:site_name" content="Invario">
+    <meta property="og:title" content="{% block title %}Digitale Schulverwaltung{% endblock %}">
+    <meta property="og:description" content="{{ meta_description|default('Invario — Lehrmittel-, Inventar- und Ausleihverwaltung für Schulen. Sicher, einfach, nachvollziehbar.') }}">
+    <meta property="og:type" content="website">
+    <meta property="og:url" content="{{ request.url_root.rstrip('/') }}{{ request.path }}">
+    <meta property="og:image" content="{{ url_for('static', filename='images/logo-1.jpeg') }}">
+    <meta name="twitter:card" content="summary_large_image">
+    <meta name="twitter:title" content="{% block title %}Digitale Schulverwaltung{% endblock %}">
+    <meta name="twitter:description" content="{{ meta_description|default('Invario — Lehrmittel-, Inventar- und Ausleihverwaltung für Schulen. Sicher, einfach, nachvollziehbar.') }}">
+    <meta name="twitter:image" content="{{ url_for('static', filename='images/logo-1.jpeg') }}">
     {% block head %}
     <link rel="preconnect" href="https://fonts.googleapis.com">
     <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>

Website/templates/main.html

@@ -1,5 +1,8 @@
 {% extends "base.html" %}
 
+{# SEO: per-page description used in base.html meta tags #}
+{% set meta_description = "Invario bündelt Lehrmittelverwaltung, Inventar und Ausleihe für Schulen – sicher, transparent und einfach zu bedienen." %}
+
 {% block title %}Digitale Schulverwaltung mit Sicherheitsfokus{% endblock %}
 
 {% block head %}
@@ -550,6 +553,21 @@
 {% endblock %}
 
 {% block content %}
+<script type="application/ld+json">
+{
+	"@context": "https://schema.org",
+	"@type": "WebSite",
+	"name": "Invario",
+	"url": "{{ request.url_root.rstrip('/') }}",
+	"description": "{{ meta_description }}",
+	"publisher": {
+		"@type": "Organization",
+		"name": "Invario",
+		"url": "{{ request.url_root.rstrip('/') }}",
+		"logo": "{{ url_for('static', filename='images/logo-1.jpeg') }}"
+	}
+}
+</script>
 <section class="hero" id="top">
 	<div>
 		<span class="eyebrow">Lehrmittelverwaltungssoftware für Schulen</span>