feat: implement JSON backup export functionality with improved download handling

Co-authored-by: Copilot <copilot@github.com>

nlog.config

@@ -10,9 +10,20 @@
             layout="${longdate}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />
     <target xsi:type="Debugger" name="debug"
             layout="${longdate}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />
+    <target xsi:type="File" name="file"
+            fileName="${gdc:item=worktrackerLogPath}"
+            createDirs="true"
+            keepFileOpen="false"
+            concurrentWrites="true"
+            archiveFileName="${gdc:item=worktrackerArchiveDirectory}/worktracker.{#}.log"
+            archiveNumbering="Rolling"
+            archiveAboveSize="10485760"
+            enableArchiveFileCompression="true"
+            maxArchiveFiles="14"
+            layout="${longdate}|${uppercase:${level}}|${logger}|${message} ${exception:format=tostring}" />
   </targets>
 
   <rules>
-    <logger name="*" minlevel="Debug" writeTo="console,debug" />
+    <logger name="*" minlevel="Debug" writeTo="console,debug,file" />
   </rules>
 </nlog>