Fix: Move favicon configuration inside main domain block

- Moved favicon.ico and favicon.png handlers inside stargirlnails.de block
- This prevents Caddy from trying to create SSL certificates for favicon files
- Uses 'handle' directive for path-specific routing within the domain
- Fixes 'Invalid identifiers requested' error for favicon files

Caddyfile

@@ -31,19 +31,19 @@ stargirlnails.de {
         output file /var/log/caddy/access.log
         format json
     }
+
+    # Favicon-Konfiguration (innerhalb der Hauptdomain)
+    handle /favicon.ico {
+        redir /favicon.png 301
+    }
+
+    handle /favicon.png {
+        root * /app/public
+        try_files {path}
+    }
 }
 
 # HTTP zu HTTPS Redirect (automatisch von Caddy)
 http://stargirlnails.de {
     redir https://stargirlnails.de{uri} permanent
 }
-
-# Favicon-Konfiguration
-favicon.ico {
-    redir /favicon.png 301
-}
-
-favicon.png {
-    root * /app/public
-    try_files {path}
-}