feat: Social-Media-Badges für TikTok und Instagram hinzugefügt

- Neue RPC-Route für Social-Media-URLs aus .env (social.ts)
- Social-Media-Badges auf der Startseite mit attraktiven Buttons
- Social-Media-Icons im Footer aller Seiten
- Social-Media-Links in allen E-Mail-Templates
- URLs aus .env: TIKTOK_PROFILE und INSTAGRAM_PROFILE

src/client/app.tsx

@@ -1,4 +1,6 @@
 import { useState, useEffect } from "react";
+import { useQuery } from "@tanstack/react-query";
+import { queryClient } from "@/client/rpc-client";
 import { useAuth } from "@/client/components/auth-provider";
 import { LoginForm } from "@/client/components/login-form";
 import { UserProfile } from "@/client/components/user-profile";
@@ -19,6 +21,12 @@ function App() {
   const { user, isLoading, isOwner } = useAuth();
   const [activeTab, setActiveTab] = useState<"profile-landing" | "booking" | "admin-treatments" | "admin-bookings" | "admin-calendar" | "admin-availability" | "admin-gallery" | "admin-reviews" | "profile" | "legal">("profile-landing");
   const [isMobileMenuOpen, setIsMobileMenuOpen] = useState(false);
+  
+  const { data: socialMedia } = useQuery(
+    queryClient.social.getSocialMedia.queryOptions()
+  );
+  
+  const hasSocialMedia = (socialMedia as any)?.tiktokProfile || (socialMedia as any)?.instagramProfile;
 
   // Prevent background scroll when menu is open
   useEffect(() => {
@@ -377,7 +385,37 @@ function App() {
       <footer className="bg-white border-t border-pink-100 mt-16">
         <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8">
           <div className="text-center text-gray-600">
-            <p>&copy; 2025 Stargirlnails Kiel. Professional nail design & care with 🩷 and passion in Kiel 🌇.</p>
+            <p className="mb-4">&copy; 2025 Stargirlnails Kiel. Professional nail design & care with 🩷 and passion in Kiel 🌇.</p>
+            {hasSocialMedia && (
+              <div className="flex justify-center items-center gap-3 mt-4">
+                {(socialMedia as any)?.instagramProfile && (
+                  <a
+                    href={(socialMedia as any).instagramProfile}
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    className="text-pink-600 hover:text-pink-700 transition-colors"
+                    aria-label="Instagram"
+                  >
+                    <svg className="w-6 h-6" fill="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+                      <path d="M12 2.163c3.204 0 3.584.012 4.85.07 3.252.148 4.771 1.691 4.919 4.919.058 1.265.069 1.645.069 4.849 0 3.205-.012 3.584-.069 4.849-.149 3.225-1.664 4.771-4.919 4.919-1.266.058-1.644.07-4.85.07-3.204 0-3.584-.012-4.849-.07-3.26-.149-4.771-1.699-4.919-4.92-.058-1.265-.07-1.644-.07-4.849 0-3.204.013-3.583.07-4.849.149-3.227 1.664-4.771 4.919-4.919 1.266-.057 1.645-.069 4.849-.069zm0-2.163c-3.259 0-3.667.014-4.947.072-4.358.2-6.78 2.618-6.98 6.98-.059 1.281-.073 1.689-.073 4.948 0 3.259.014 3.668.072 4.948.2 4.358 2.618 6.78 6.98 6.98 1.281.058 1.689.072 4.948.072 3.259 0 3.668-.014 4.948-.072 4.354-.2 6.782-2.618 6.979-6.98.059-1.28.073-1.689.073-4.948 0-3.259-.014-3.667-.072-4.947-.196-4.354-2.617-6.78-6.979-6.98-1.281-.059-1.69-.073-4.949-.073zm0 5.838c-3.403 0-6.162 2.759-6.162 6.162s2.759 6.163 6.162 6.163 6.162-2.759 6.162-6.163c0-3.403-2.759-6.162-6.162-6.162zm0 10.162c-2.209 0-4-1.79-4-4 0-2.209 1.791-4 4-4s4 1.791 4 4c0 2.21-1.791 4-4 4zm6.406-11.845c-.796 0-1.441.645-1.441 1.44s.645 1.44 1.441 1.44c.795 0 1.439-.645 1.439-1.44s-.644-1.44-1.439-1.44z"/>
+                    </svg>
+                  </a>
+                )}
+                {(socialMedia as any)?.tiktokProfile && (
+                  <a
+                    href={(socialMedia as any).tiktokProfile}
+                    target="_blank"
+                    rel="noopener noreferrer"
+                    className="text-gray-800 hover:text-gray-900 transition-colors"
+                    aria-label="TikTok"
+                  >
+                    <svg className="w-6 h-6" fill="currentColor" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+                      <path d="M19.59 6.69a4.83 4.83 0 0 1-3.77-4.25V2h-3.45v13.67a2.89 2.89 0 0 1-5.2 1.74 2.89 2.89 0 0 1 2.31-4.64 2.93 2.93 0 0 1 .88.13V9.4a6.84 6.84 0 0 0-1-.05A6.33 6.33 0 0 0 5 20.1a6.34 6.34 0 0 0 10.86-4.43v-7a8.16 8.16 0 0 0 4.77 1.52v-3.4a4.85 4.85 0 0 1-1-.1z"/>
+                    </svg>
+                  </a>
+                )}
+              </div>
+            )}
           </div>
         </div>
       </footer>