Feat: Rechnungsadresse — Profil, Upgrade-Modal Hinweis, Rechnung-erstellen-Button in Upgrade-Cards (SW by-v967)

backend/routes/admin.py

@@ -1137,7 +1137,7 @@ async def list_upgrade_requests(user=Depends(require_admin)):
     with db() as conn:
         rows = conn.execute("""
             SELECT r.id, r.user_id, r.tier, r.message, r.created_at, r.fulfilled_at,
-                   u.name, u.email
+                   u.name, u.email, u.billing_address
             FROM upgrade_requests r
             JOIN users u ON u.id = r.user_id
             ORDER BY r.fulfilled_at IS NOT NULL, r.created_at DESC