chore: snipe-it fix postInstall script

hosts/AZ-CLD-1/services/snipe-it.nix

@@ -1,12 +1,24 @@
 {
   config,
   lib,
+  pkgs,
   ...
 }: let
   serviceName = "snipe-it";
   servicePort = config.m3ta.ports.get serviceName;
   mysqlPort = config.m3ta.ports.get "mysql";
   hostName = "am.az-gruppe.com";
+
+  restoreDefaults = pkgs.writeShellScript "snipe-it-restore-defaults" ''
+    set -euo pipefail
+    src="${pkgs.snipe-it}/share/snipe-it/uploads"
+    dst="/var/lib/snipe-it/public/uploads"
+
+    if [ -d "$src" ] && [ -d "$dst" ]; then
+      # -n = kein Überschreiben existierender Dateien (User-Uploads bleiben erhalten)
+      cp -rn "$src/." "$dst/"
+    fi
+  '';
 in {
   services.${serviceName} = {
     enable = true;
@@ -52,6 +64,9 @@ in {
     after = ["mysql.service"];
     requires = ["mysql.service"];
     unitConfig.ConditionPathExists = "${config.services.mysql.dataDir}/snipeit";
+    serviceConfig = {
+      ExecStartPre = ["+${restoreDefaults}"];
+    };
   };
 
   # Traefik configuration