Add packaging dependency and fallback version compare

update_checker.py

@@ -7,7 +7,11 @@ Prüft auf Updates über Gitea API
 import urllib.request
 import json
 from pathlib import Path
-from packaging import version as pkg_version
+
+try:
+    from packaging import version as pkg_version
+except Exception:  # pragma: no cover - packaging may be missing in user envs
+    pkg_version = None
 
 # Gitea-Konfiguration
 GITEA_URL = "https://git.file-archive.de"
@@ -81,14 +85,53 @@ def check_for_updates():
     
     try:
         # Vergleiche Versionen
-        if pkg_version.parse(latest) > pkg_version.parse(current):
-            return True, latest, url
+        if pkg_version is not None:
+            if pkg_version.parse(latest) > pkg_version.parse(current):
+                return True, latest, url
+        else:
+            if _simple_version_compare(latest, current) > 0:
+                return True, latest, url
     except Exception as e:
         print(f"Warnung: Versionenvergleich fehlgeschlagen: {e}")
     
     return False, None, None
 
 
+def _simple_version_compare(left, right):
+    """
+    Fallback-Versionsvergleich ohne externe Abhaengigkeiten.
+    Gibt 1 zurueck wenn left > right, -1 wenn left < right, sonst 0.
+    """
+    def to_parts(value):
+        parts = []
+        for item in value.replace("v", "").split("."):
+            try:
+                parts.append(int(item))
+            except ValueError:
+                parts.append(item)
+        return parts
+
+    left_parts = to_parts(left)
+    right_parts = to_parts(right)
+    max_len = max(len(left_parts), len(right_parts))
+
+    for i in range(max_len):
+        l_val = left_parts[i] if i < len(left_parts) else 0
+        r_val = right_parts[i] if i < len(right_parts) else 0
+        if l_val == r_val:
+            continue
+        try:
+            return 1 if l_val > r_val else -1
+        except TypeError:
+            l_str = str(l_val)
+            r_str = str(r_val)
+            if l_str == r_str:
+                continue
+            return 1 if l_str > r_str else -1
+
+    return 0
+
+
 if __name__ == "__main__":
     # Test
     current = get_current_version()