fix: Disable sample data seeding in production environment

- Sample data (products, categories, orders) now only seeds in Development
- Production environment will start with empty database (admin user only)
- Ensures clean state for testing without pre-populated data

This allows production deployments to start with a truly empty database
for testing purposes, while development still gets sample data for
local testing.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

LittleShop/Program.cs

@@ -461,9 +461,13 @@ using (var scope = app.Services.CreateScope())
     var authService = scope.ServiceProvider.GetRequiredService<IAuthService>();
     await authService.SeedDefaultUserAsync();
 
-    // Seed sample data
-    var dataSeeder = scope.ServiceProvider.GetRequiredService<IDataSeederService>();
-    await dataSeeder.SeedSampleDataAsync();
+    // Seed sample data - only in development
+    if (app.Environment.IsDevelopment())
+    {
+        Log.Information("Development environment: Seeding sample data");
+        var dataSeeder = scope.ServiceProvider.GetRequiredService<IDataSeederService>();
+        await dataSeeder.SeedSampleDataAsync();
+    }
 
     // Seed system settings - enable test currencies only in development
     if (app.Environment.IsDevelopment())