Add setup script for development (#981)

tools/run-start.mjs

@@ -0,0 +1,27 @@
+#!/usr/bin/env node
+import { spawn } from 'child_process';
+import fs from 'fs';
+
+// Load .env file if it exists
+if (fs.existsSync('.env')) {
+    const envFile = fs.readFileSync('.env', 'utf8');
+    envFile.split('\n').forEach(line => {
+        const [key, value] = line.split('=');
+        if (key && value) {
+            process.env[key] = value;
+        }
+    });
+}
+
+// Set defaults if not in environment
+const foundryPath = process.env.FOUNDRY_MAIN_PATH || '../../../../FoundryDev/main.js';
+const dataPath = process.env.FOUNDRY_DATA_PATH || '../../../';
+
+// Run the original command with proper environment
+const args = ['rollup -c --watch', `node "${foundryPath}" --dataPath="${dataPath}" --noupnp`, 'gulp'];
+
+spawn('npx', ['concurrently', ...args.map(arg => `"${arg}"`)], {
+    stdio: 'inherit',
+    cwd: process.cwd(),
+    shell: true
+});