feat: Introduce site configuration management with a new Prisma model and API endpoints, and add a health check endpoint.

src/lib/visitor.ts

@@ -1,10 +1,25 @@
 export function getVisitorId() {
+  if (typeof window === "undefined") return null;
+
   let visitorId = localStorage.getItem("visitor_id");
 
   if (!visitorId) {
-    visitorId = crypto.randomUUID();
+    if (crypto?.randomUUID) {
+      visitorId = crypto.randomUUID();
+    } else {
+      visitorId = generateUUID();
+    }
+
     localStorage.setItem("visitor_id", visitorId);
   }
 
   return visitorId;
 }
+
+function generateUUID() {
+  return "xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx".replace(/[xy]/g, function (c) {
+    const r = (Math.random() * 16) | 0;
+    const v = c === "x" ? r : (r & 0x3) | 0x8;
+    return v.toString(16);
+  });
+}