fix: auto-detect all LAN IPs for dev auth and HMR

No more manual LAN_HOST or BETTER_AUTH_TRUSTED_ORIGINS for dev.
Uses os.networkInterfaces() to allow all machine IPs automatically.

next.config.ts

@@ -1,9 +1,16 @@
 import type { NextConfig } from "next";
+import os from "os";
+
+// Автоопределение LAN IP для dev — убирает "Blocked cross-origin" без ручной настройки
+const lanIPs = Object.values(os.networkInterfaces())
+  .flat()
+  .filter((iface) => iface && !iface.internal && iface.family === "IPv4")
+  .map((iface) => iface!.address);
 
 const nextConfig: NextConfig = {
   output: "standalone",
   serverExternalPackages: ["@prisma/client", "bcryptjs", "ioredis"],
-  allowedDevOrigins: ["192.168.1.78"],
+  allowedDevOrigins: lanIPs,
 };
 
 export default nextConfig;