feat: Refactor user management to replace email with username across the application

update-queries.ps1

@@ -0,0 +1,20 @@
+$files = @(
+    "d:\panel\src\lib\queries\tasks.js",
+    "d:\panel\src\lib\userManagement.js"
+)
+
+foreach ($file in $files) {
+    if (Test-Path $file) {
+        Write-Host "Updating $file..."
+        $content = Get-Content $file -Raw
+        $content = $content -replace "creator\.email as created_by_email", "creator.username as created_by_username"
+        $content = $content -replace "assignee\.email as assigned_to_email", "assignee.username as assigned_to_username"
+        $content = $content -replace "u\.email as created_by_email", "u.username as created_by_username"
+        $content = $content -replace "SELECT id, name, email, role", "SELECT id, name, username, role"
+        $content = $content -replace "name, email, role", "name, username, role"
+        Set-Content $file $content -NoNewline
+        Write-Host "Updated $file"
+    }
+}
+
+Write-Host "All files updated!"