feat(control): show display block version in control block

closes #54

control/main.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"encoding/json"
 	"log/slog"
 	"net"
 	"net/http"
@@ -83,18 +84,40 @@ func pingRoute(ctx echo.Context) error {
 		return ctx.JSON(http.StatusOK, PingResponse{Status: "host_offline"})
 	}
 
-	conn, err := net.DialTimeout("tcp", ip+":1323", 5*time.Second)
+	client := http.Client{
+		Timeout: 5 * time.Second,
+	}
+
+	resp, err := client.Get("http://" + ip + ":1323/api/ping")
 	if err != nil {
 		return ctx.JSON(http.StatusOK, PingResponse{Status: "app_offline"})
 	}
-	conn.Close()
+	defer resp.Body.Close()
+	if resp.StatusCode != http.StatusOK {
+		return ctx.JSON(http.StatusOK, PingResponse{Status: "app_offline"})
+	}
 
-	return ctx.JSON(http.StatusOK, PingResponse{Status: "app_online"})
+	var appPing AppPingResponse
+	if err := json.NewDecoder(resp.Body).Decode(&appPing); err != nil {
+		return ctx.JSON(http.StatusOK, PingResponse{
+			Status: "app_offline",
+		})
+	}
+
+	return ctx.JSON(http.StatusOK, PingResponse{
+		Status:  "app_online",
+		Version: appPing.Version,
+	})
+}
+
+type AppPingResponse struct {
+	Version string `json:"version"`
 }
 
 type PingResponse struct {
-	Status string `json:"status"`
-	Error  string `json:"error"`
+	Status  string `json:"status"`
+	Version string `json:"version"`
+	Error   string `json:"error"`
 }
 
 type WakeOnLanRequest struct {