Reorganize repository structure and move poster.jpg back to root

- Create vr180player/ folder with organized structure:
  - vr180player/images/ for all UI control images
  - vr180player/vr180-player.js and vr180player/vr180-player.css
- Move poster.jpg back to root level alongside main content files
- Update all file references in index.html and CSS files
- Maintain clean separation between main content and player components
- All functionality preserved with improved organization

index.html

@@ -4,7 +4,7 @@
 	<meta charset="UTF-8">
 	<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
 	<title>VR180 Web Player</title>
-	<link rel="stylesheet" href="vr180-player.css">
+	<link rel="stylesheet" href="vr180player/vr180-player.css">
 	<style>
         body {
 		  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
@@ -31,7 +31,7 @@
 				<source src="sbs-video.mp4" type="video/mp4">
 			</video>
 			<button id="playBtn" aria-label="Play video">
-				<img src="play.png" alt="Play">
+				<img src="vr180player/images/play.png" alt="Play">
 			</button>
 			<div id="panel">
 				<div id="status">
@@ -56,6 +56,6 @@
 			</div>
 		</div>
 	</main>
-	<script type="module" src="vr180-player.js"></script>
+	<script type="module" src="vr180player/vr180-player.js"></script>
 </body>
 </html>