restructure seed

DBSeed/Program.cs

@@ -0,0 +1,33 @@
+using DBSeed;
+using Microsoft.Data.SqlClient;
+
+try
+{
+    var connectionString = Environment.GetEnvironmentVariable(
+        "DB_CONNECTION_STRING"
+    );
+    if (string.IsNullOrWhiteSpace(connectionString))
+        throw new InvalidOperationException(
+            "Environment variable DB_CONNECTION_STRING is not set or is empty."
+        );
+
+    await using var connection = new SqlConnection(connectionString);
+    await connection.OpenAsync();
+
+    Console.WriteLine("Connected to database.");
+
+    await LocationSeeder.SeedAsync(connection);
+    Console.WriteLine("Seeded locations.");
+
+    await UserSeeder.SeedAsync(connection);
+    Console.WriteLine("Seeded users.");
+
+    Console.WriteLine("Seed completed successfully.");
+    return 0;
+}
+catch (Exception ex)
+{
+    Console.Error.WriteLine("Seed failed:");
+    Console.Error.WriteLine(ex);
+    return 1;
+}