Installer divided into several modules and added new MessageDialog module

network.py

@@ -0,0 +1,40 @@
+import socket
+import urllib.request
+import json
+
+
+class GiteaUpdate:
+    @staticmethod
+    def api_down(url, current_version=""):
+        """Get latest version from Gitea API"""
+        try:
+            with urllib.request.urlopen(url, timeout=10) as response:
+                data = json.loads(response.read().decode())
+                if data and len(data) > 0:
+                    latest_version = data[0].get("tag_name", "Unknown")
+                    return latest_version.lstrip("v")  # Remove 'v' prefix if present
+                return "Unknown"
+        except Exception as e:
+            print(f"API Error: {e}")
+            return "Unknown"
+
+
+class NetworkChecker:
+    @staticmethod
+    def check_internet_connection(host="8.8.8.8", port=53, timeout=3):
+        """Check if internet connection is available"""
+        try:
+            socket.setdefaulttimeout(timeout)
+            socket.socket(socket.AF_INET, socket.SOCK_STREAM).connect((host, port))
+            return True
+        except socket.error:
+            return False
+
+    @staticmethod
+    def check_repository_access(url="https://git.ilunix.de", timeout=5):
+        """Check if repository is accessible"""
+        try:
+            urllib.request.urlopen(url, timeout=timeout)
+            return True
+        except:
+            return False