added migration seeders models and test script

app/Database/Seeds/AiProvidersSeeder.php

@@ -0,0 +1,40 @@
+<?php
+
+namespace App\Database\Seeds;
+
+use CodeIgniter\Database\Seeder;
+
+class AiProvidersSeeder extends Seeder
+{
+    public function run()
+    {
+        $data = [
+            [
+                'id' => '550e8400-e29b-41d4-a716-446655440001',
+                'name' => 'openai',
+                'display_name' => 'OpenAI',
+                'base_url' => 'https://api.openai.com/v1',
+                'is_builtin' => true,
+                'created_at' => date('Y-m-d H:i:s'),
+            ],
+            [
+                'id' => '550e8400-e29b-41d4-a716-446655440002',
+                'name' => 'anthropic',
+                'display_name' => 'Anthropic',
+                'base_url' => 'https://api.anthropic.com',
+                'is_builtin' => true,
+                'created_at' => date('Y-m-d H:i:s'),
+            ],
+            [
+                'id' => '550e8400-e29b-41d4-a716-446655440003',
+                'name' => 'google',
+                'display_name' => 'Google AI',
+                'base_url' => 'https://generativelanguage.googleapis.com/v1',
+                'is_builtin' => true,
+                'created_at' => date('Y-m-d H:i:s'),
+            ],
+        ];
+
+        $this->db->table('ai_providers')->insertBatch($data);
+    }
+}