Fix formula export casing: use camelCase to match import property lookups

System.Text.Json defaults to PascalCase for anonymous types, producing
"Name"/"OutputMode" etc., while the import used TryGetProperty("name")
causing every template to fail with "no name". Adding CamelCase naming
policy aligns the export format with what the import expects.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/PowderCoating.Web/Controllers/CompanySettingsController.cs

@@ -3073,7 +3073,11 @@ public class CompanySettingsController : Controller
         };
 
         var json = System.Text.Json.JsonSerializer.Serialize(export,
-            new System.Text.Json.JsonSerializerOptions { WriteIndented = true });
+            new System.Text.Json.JsonSerializerOptions
+            {
+                WriteIndented = true,
+                PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase
+            });
         var filename = $"formula-templates-{DateTime.UtcNow:yyyyMMdd}.json";
         return File(System.Text.Encoding.UTF8.GetBytes(json), "application/json", filename);
     }