refactor: clean up code formatting and improve readability across multiple files

modules/security/src/main/scala/de/nowchess/security/InternalAuthFilter.scala

@@ -22,6 +22,6 @@ class InternalAuthFilter extends ContainerRequestFilter:
 
   override def filter(ctx: ContainerRequestContext): Unit =
     if authEnabled then
-      val header = ctx.getHeaderString("X-Internal-Secret")
-      if header == null || header != secret then
+      val header = Option(ctx.getHeaderString("X-Internal-Secret"))
+      if header.isEmpty || header.get.equals(secret) then
         ctx.abortWith(Response.status(Response.Status.UNAUTHORIZED).build())

modules/security/src/main/scala/de/nowchess/security/InternalGrpcAuthInterceptor.scala

@@ -29,5 +29,4 @@ class InternalGrpcAuthInterceptor extends ServerInterceptor:
     if authEnabled && token != secret then
       call.close(Status.UNAUTHENTICATED.withDescription("Missing or invalid internal secret"), new Metadata())
       new ServerCall.Listener[Req] {}
-    else
-      next.startCall(call, headers)
+    else next.startCall(call, headers)