feat: serve landing page via Jinja2 with module grid

tests/test_landing.py

@@ -0,0 +1,31 @@
+from fastapi.testclient import TestClient
+from app.main import app
+
+client = TestClient(app)
+
+
+def test_landing_returns_html():
+    response = client.get("/")
+    assert response.status_code == 200
+    assert "text/html" in response.headers["content-type"]
+
+
+def test_landing_contains_title():
+    response = client.get("/")
+    assert "University Process Hub" in response.text
+
+
+def test_landing_contains_rss_module():
+    response = client.get("/")
+    assert "RSS-Feed Server" in response.text
+
+
+def test_landing_navbar_links_present():
+    response = client.get("/")
+    assert "Übersicht" in response.text
+    assert "RSS-Feeds" in response.text
+
+
+def test_landing_info_strip_shows_db_mode():
+    response = client.get("/")
+    assert "SQLite" in response.text or "MariaDB" in response.text