added migration seeders models and test script

app/Models/MarketplaceThemeModel.php

@@ -0,0 +1,68 @@
+<?php
+
+namespace App\Models;
+
+use CodeIgniter\Model;
+
+class MarketplaceThemeModel extends Model
+{
+    protected $table = 'marketplace_themes';
+    protected $primaryKey = 'id';
+    protected $useAutoIncrement = false;
+    protected $returnType = 'array';
+    protected $useSoftDeletes = false;
+    protected $allowedFields = [
+        'id',
+        'name',
+        'display_name',
+        'description',
+        'author',
+        'version',
+        'thumbnail_url',
+        'download_url',
+        'price',
+        'is_published',
+        'metadata',
+        'created_at',
+        'updated_at',
+    ];
+
+    protected $useTimestamps = true;
+    protected $createdField = 'created_at';
+    protected $updatedField = 'updated_at';
+
+    protected $validationRules = [
+        'name' => 'required|max_length[255]|is_unique[marketplace_themes.name]',
+        'display_name' => 'required|max_length[255]',
+        'download_url' => 'required',
+    ];
+
+    // Get published themes only
+    public function getPublished()
+    {
+        return $this->where('is_published', true)
+                    ->orderBy('created_at', 'DESC')
+                    ->get()
+                    ->getResultArray();
+    }
+
+    // Get free themes
+    public function getFreeThemes()
+    {
+        return $this->where('price', 0)
+                    ->where('is_published', true)
+                    ->orderBy('created_at', 'DESC')
+                    ->get()
+                    ->getResultArray();
+    }
+
+    // Get paid themes
+    public function getPaidThemes()
+    {
+        return $this->where('price >', 0)
+                    ->where('is_published', true)
+                    ->orderBy('price', 'ASC')
+                    ->get()
+                    ->getResultArray();
+    }
+}