feat: add remote host configuration support for Unity WebSocket connection

Add configurable host property to McpUnity class with support for UNITY_HOST
environment variable and Host configuration in Unity's McpUnitySettings.json.
Maintains full backward compatibility with original Unity workflow while
enabling remote Unity Editor connections across network.

Author: ichimi abunai

Server~/src/unity/mcpUnity.ts

@@ -34,6 +34,7 @@ interface UnityResponse {
 export class McpUnity {
   private logger: Logger;
   private port: number | null = null;
+  private host: string = 'localhost';
   private ws: WebSocket | null = null;
   private pendingRequests: Map<string, PendingRequest> = new Map<string, PendingRequest>();
   private requestTimeout = 10000;
@@ -80,6 +81,10 @@ export class McpUnity {
     this.port = configPort ? parseInt(configPort, 10) : 8090;
     this.logger.info(`Using port: ${this.port} for Unity WebSocket connection`);
 
+    // Check environment variable first, then config file, then default to localhost
+    const configHost = process.env.UNITY_HOST || config.Host;
+    this.host = configHost || 'localhost';
+    
     // Initialize timeout from environment variable (in seconds; it is the same as Cline) or use default (10 seconds)
     const configTimeout = config.RequestTimeoutSeconds;
     this.requestTimeout = configTimeout ? parseInt(configTimeout, 10) * 1000 : 10000;
@@ -100,7 +105,7 @@ export class McpUnity {
     this.disconnect();
 
     return new Promise<void>((resolve, reject) => {
-      const wsUrl = `ws://localhost:${this.port}/McpUnity`;
+      const wsUrl = `ws://${this.host}:${this.port}/McpUnity`;
       this.logger.debug(`Connecting to ${wsUrl}...`);
 
       // Create connection options with headers for client identification