refactor: Move Astro to root, use PORT env (default 80), allow all hosts

- Move Astro files from dealplustech-astro/ to project root
- Update Dockerfile: PORT environment variable (default 80)
- Add vite.config.ts with allowedHosts: true
- Matches nixpacks behavior for Easypanel deployment
- No hardcoded ports or domains

node_modules/is-wsl/index.js

@@ -0,0 +1,36 @@
+import process from 'node:process';
+import os from 'node:os';
+import fs from 'node:fs';
+import isInsideContainer from 'is-inside-container';
+
+const isWsl = () => {
+	if (process.platform !== 'linux') {
+		return false;
+	}
+
+	if (os.release().toLowerCase().includes('microsoft')) {
+		if (isInsideContainer()) {
+			return false;
+		}
+
+		return true;
+	}
+
+	try {
+		if (fs.readFileSync('/proc/version', 'utf8').toLowerCase().includes('microsoft')) {
+			return !isInsideContainer();
+		}
+	} catch {}
+
+	// Fallback for custom kernels: check WSL-specific paths.
+	if (
+		fs.existsSync('/proc/sys/fs/binfmt_misc/WSLInterop')
+		|| fs.existsSync('/run/WSL')
+	) {
+		return !isInsideContainer();
+	}
+
+	return false;
+};
+
+export default process.env.__IS_WSL_TEST__ ? isWsl : isWsl();