first commit

src/config/peer.ts

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+import type { PeerJSOption } from 'peerjs'
+
+/**
+ * PeerJS 기본 TURN(turn.peerjs.com)이 중단되어 ICE 연결이 실패합니다.
+ * STUN + 공개 TURN 릴레이를 명시적으로 설정합니다.
+ *
+ * 자체 TURN 서버가 있으면 .env에 설정:
+ *   VITE_TURN_URLS=turn:your.server:3478
+ *   VITE_TURN_USERNAME=...
+ *   VITE_TURN_CREDENTIAL=...
+ */
+function buildIceServers(): RTCIceServer[] {
+  const servers: RTCIceServer[] = [
+    { urls: 'stun:stun.l.google.com:19302' },
+  ]
+
+  const customTurnUrls = import.meta.env.VITE_TURN_URLS
+  if (customTurnUrls) {
+    servers.push({
+      urls: customTurnUrls.split(',').map((u: string) => u.trim()),
+      username: import.meta.env.VITE_TURN_USERNAME,
+      credential: import.meta.env.VITE_TURN_CREDENTIAL,
+    })
+  } else {
+    const relay = {
+      username: 'openrelayproject',
+      credential: 'openrelayproject',
+    }
+    servers.push(
+      { urls: ['turn:openrelay.metered.ca:80', 'turn:openrelay.metered.ca:443'], ...relay },
+    )
+  }
+
+  return servers
+}
+
+export function createPeerOptions(id?: string): PeerJSOption {
+  return {
+    ...(id ? {} : {}),
+    host: '0.peerjs.com',
+    port: 443,
+    path: '/',
+    secure: true,
+    debug: import.meta.env.DEV ? 1 : 0,
+    config: {
+      iceServers: buildIceServers(),
+      iceCandidatePoolSize: 10,
+    },
+  }
+}