fix android shit + fix clients not showing if 2 clients have the same username and pc name as another client

Overlord-Client/cmd/agent/config/identity_android.go

@@ -2,6 +2,37 @@
 
 package config
 
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"log"
+	"os"
+	"strings"
+)
+
+const androidMachineIDFile = "config/android_machine_id"
+
 func platformMachineID() string {
-	return ""
+	data, err := os.ReadFile(androidMachineIDFile)
+	if err == nil {
+		if id := strings.TrimSpace(string(data)); id != "" {
+			return id
+		}
+	}
+
+	b := make([]byte, 16)
+	if _, err := rand.Read(b); err != nil {
+		log.Printf("[identity] WARNING: failed to generate android machine ID: %v", err)
+		return ""
+	}
+	id := hex.EncodeToString(b)
+
+	if err := os.MkdirAll("config", 0700); err != nil {
+		log.Printf("[identity] WARNING: failed to create config dir for android machine ID: %v", err)
+		return id
+	}
+	if err := os.WriteFile(androidMachineIDFile, []byte(id), 0600); err != nil {
+		log.Printf("[identity] WARNING: failed to persist android machine ID: %v", err)
+	}
+	return id
 }