chore: add badges, theme screenshot to README

Add license, Go version, Docker pulls badges. Include theme
screenshot in gallery as full-width row.

README.md

@@ -3,6 +3,12 @@
   <p>Self-hosted uptime monitoring with a TUI over SSH.</p>
   <p>No browser. No client install. Just <code>ssh -p 23234 your-server</code>.</p>
 
+  <p>
+    <img src="https://img.shields.io/badge/license-MIT-blue" alt="MIT License">
+    <img src="https://img.shields.io/badge/go-1.26-00ADD8?logo=go&logoColor=white" alt="Go 1.26">
+    <img src="https://img.shields.io/docker/pulls/lerkolabs/uptop" alt="Docker Pulls">
+  </p>
+
   <img src="assets/monitors.png" alt="uptop monitors view" width="800">
 </div>
 
@@ -34,6 +40,9 @@ Built on [RDGames/go-upkeep](https://github.com/RDGames/go-upkeep). Rewritten fo
     <td><img src="assets/logs.png" alt="logs view" width="400"></td>
     <td><img src="assets/nodes.png" alt="cluster nodes" width="400"></td>
   </tr>
+  <tr>
+    <td colspan="2" align="center"><img src="assets/theme.png" alt="theme selection" width="600"></td>
+  </tr>
 </table>
 
 ## Quick start