Initial commit: Production-ready KoalaSync Monorepo with Manifest V3, Socket.IO Relay, and Two-Phase Sync

shared/constants.js

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+/**
+ * KoalaSync Shared Constants & Protocol Definitions
+ */
+
+export const PROTOCOL_VERSION = "1.0.0";
+export const APP_VERSION = "1.0.0";
+
+export const OFFICIAL_SERVER_URL = 'wss://sync.shik3i.net';
+export const OFFICIAL_SERVER_TOKEN = '39ce48b42aa442a34b80cfe2d7314177d4c725c4316b1f83aa3a1e2f0f5c5bfd';
+
+export const EVENTS = {
+    // Connection & Room
+    JOIN_ROOM: "join_room",
+    LEAVE_ROOM: "leave_room",
+    ROOM_DATA: "room_data", // Server -> Client: current room state
+    ERROR: "error",
+
+    // Media Control
+    PLAY: "play",
+    PAUSE: "pause",
+    SEEK: "seek",
+    
+    // Sync Coordination
+    PEER_STATUS: "peer_status", // Heartbeat from peers
+    FORCE_SYNC_PREPARE: "force_sync_prepare",
+    FORCE_SYNC_ACK: "force_sync_ack",
+    FORCE_SYNC_EXECUTE: "force_sync_execute"
+};
+
+export const HEARTBEAT_INTERVAL = 15000; // 15s
+export const FORCE_SYNC_TIMEOUT = 5000; // 5s timeout for ACKs