SEO: llms.txt v1.5.1 + sitemap /zuechter + JSON-LD Pricing (Pro 29€/Züchter 49€)

- llms.txt: Dual-Audience-Positionierung, echte Preise, neue Züchter-Features
  (Warteliste, Läufigkeit, Wurf-Buchstabe/-Name, Privater Header, Profilfotos),
  neue URL /zuechter, SW by-v918, Datum 2026-05-14
- landing.html JSON-LD: 3 Offers (kostenlos/Pro 29€/Züchter 49€), 7 neue featureList-Einträge,
  dateModified 2026-05-14, Beschreibung mit Preisen
- zuechter.html JSON-LD: 2 Offers (49€/39€ Gründer), 5 neue Features, dateModified + softwareVersion
- sitemap.xml: neue statische Datei (Backup-Referenz, dynamic route in main.py)
- main.py sitemap: /zuechter mit priority 0.9 hinzugefügt

backend/main.py

@@ -465,10 +465,11 @@ async def sitemap():
     today = date.today().isoformat()
     urls = [
         ("https://banyaro.app/", "weekly", "1.0"),
-        ("https://banyaro.app/info", "monthly", "0.9"),
-        ("https://banyaro.app/presse", "monthly", "0.8"),
+        ("https://banyaro.app/zuechter", "weekly", "0.9"),
+        ("https://banyaro.app/info", "monthly", "0.8"),
+        ("https://banyaro.app/presse", "monthly", "0.7"),
         ("https://banyaro.app/wiki/rassen", "weekly", "0.8"),
-        ("https://banyaro.app/knigge", "monthly", "0.8"),
+        ("https://banyaro.app/knigge", "monthly", "0.7"),
         ("https://banyaro.app/wurfboerse", "daily", "0.8"),
     ]