Add Wi-Fi scan details display and MQTT publish

- HTML: Add Wi-Fi scan results container to network.html
- Rust: Implement `wifi_scan_details()` with RSSI, channel, auth method
- API & UI: Fetch and display scan results in table format
- MQTT: Publish top 10 networks sorted by RSSI to `/wifi_scan`

Software/MainBoard/rust/src/main.rs

@@ -280,6 +280,7 @@ async fn safe_main(spawner: Spawner) -> FatResult<()> {
             error!("Error publishing battery state {e}");
         });
         let _ = mqtt::publish_mppt_state(&mut board).await;
+        let _ = mqtt::publish_wifi_scan(&mut board).await;
     }
 
     log(