added migration seeders models and test script

app/Models/UserAiSettingsModel.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class UserAiSettingsModel extends Model
+{
+    protected $table = 'user_ai_settings';
+    protected $primaryKey = 'user_id';
+    protected $useAutoIncrement = false;
+    protected $returnType = 'array';
+    protected $useSoftDeletes = false;
+    protected $allowedFields = [
+        'user_id',
+        'default_provider_id',
+        'default_model',
+        'max_tokens',
+        'temperature',
+        'updated_at',
+    ];
+
+    protected $useTimestamps = false;
+
+    protected $validationRules = [
+        'user_id' => 'required',
+        'max_tokens' => 'permit_empty|integer|greater_than[0]',
+        'temperature' => 'permit_empty|numeric|greater_than_equal_to[0]|less_than_equal_to[2]',
+    ];
+
+    // Get or create settings for user
+    public function getSettings($userId)
+    {
+        $settings = $this->find($userId);
+
+        if (!$settings) {
+            // Create default settings
+            $this->insert([
+                'user_id' => $userId,
+                'default_provider_id' => null,
+                'default_model' => null,
+                'max_tokens' => 2048,
+                'temperature' => 0.7,
+                'updated_at' => date('Y-m-d H:i:s'),
+            ]);
+            $settings = $this->find($userId);
+        }
+
+        return $settings;
+    }
+
+    // Update settings for user
+    public function updateSettings($userId, $data)
+    {
+        $data['updated_at'] = date('Y-m-d H:i:s');
+        return $this->update($userId, $data);
+    }
+
+    // Get settings with provider info
+    public function getSettingsWithProvider($userId)
+    {
+        return $this->select('user_ai_settings.*, ai_providers.name as provider_name, ai_providers.display_name')
+                    ->join('ai_providers', 'user_ai_settings.default_provider_id = ai_providers.id', 'left')
+                    ->where('user_ai_settings.user_id', $userId)
+                    ->get()
+                    ->getRowArray();
+    }
+}