Add Oudelaa dashboard API integration

oudelaa_dashboard/lib/auth/jwt.ts

@@ -0,0 +1,23 @@
+export function parseJwtPayload(token: string): Record<string, unknown> | null {
+  const parts = token.split(".");
+  if (parts.length < 2) return null;
+
+  try {
+    const normalized = parts[1].replace(/-/g, "+").replace(/_/g, "/");
+    const decoded =
+      typeof window !== "undefined"
+        ? window.atob(normalized)
+        : Buffer.from(normalized, "base64").toString("utf8");
+    return JSON.parse(decoded) as Record<string, unknown>;
+  } catch {
+    return null;
+  }
+}
+
+export function isJwtExpired(token: string, skewSeconds = 15): boolean {
+  const payload = parseJwtPayload(token);
+  const exp = typeof payload?.exp === "number" ? payload.exp : null;
+  if (!exp) return false;
+  const now = Math.floor(Date.now() / 1000);
+  return exp <= now + skewSeconds;
+}