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.

src/lib/auth.ts

@@ -1,24 +1,29 @@
 import { betterAuth } from "better-auth";
 import { prismaAdapter } from "better-auth/adapters/prisma";
 import { prisma } from "./prisma";
+import os from "os";
 
 function getTrustedOrigins(): string[] {
+  // Prod: явный список origins
   if (process.env.BETTER_AUTH_TRUSTED_ORIGINS) {
     return process.env.BETTER_AUTH_TRUSTED_ORIGINS.split(",").map((o) => o.trim());
   }
 
-  // Без явной конфигурации — разрешаем localhost на типичных портах Next.js
-  const origins: string[] = [];
-  for (let port = 3000; port <= 3010; port++) {
-    origins.push(`http://localhost:${port}`);
-    origins.push(`http://127.0.0.1:${port}`);
+  // Dev: автоопределение всех IP машины — работает с любого адреса без настройки
+  const hosts = new Set(["localhost", "127.0.0.1"]);
+
+  for (const ifaces of Object.values(os.networkInterfaces())) {
+    for (const iface of ifaces ?? []) {
+      if (!iface.internal && iface.family === "IPv4") {
+        hosts.add(iface.address);
+      }
+    }
   }
 
-  // LAN-доступ: если задан LAN_HOST (IP сервера в локальной сети)
-  const lanHost = process.env.LAN_HOST;
-  if (lanHost) {
+  const origins: string[] = [];
+  for (const host of hosts) {
     for (let port = 3000; port <= 3010; port++) {
-      origins.push(`http://${lanHost}:${port}`);
+      origins.push(`http://${host}:${port}`);
     }
   }