feat: add save feature

app/Models/SavedItem.php

@@ -0,0 +1,49 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+class SavedItem extends Model
+{
+    protected $table = 'saved_items';
+    
+    protected $fillable = [
+        'user_id',
+        'saveable_id',
+        'saveable_type',
+    ];
+    
+    public function user(): BelongsTo
+    {
+        return $this->belongsTo(User::class);
+    }
+    
+    public function saveable(): MorphTo
+    {
+        return $this->morphTo();
+    }
+    
+    // Helper to get saved items by type
+    public static function getSavedItemsForUser($userId, $type = null)
+    {
+        $query = self::with('saveable')->where('user_id', $userId);
+        
+        if ($type) {
+            $query->where('saveable_type', $type);
+        }
+        
+        return $query->latest()->get();
+    }
+    
+    // Check if user has saved specific item
+    public static function isSavedByUser($userId, $saveableId, $saveableType)
+    {
+        return self::where([
+            'user_id' => $userId,
+            'saveable_id' => $saveableId,
+            'saveable_type' => $saveableType,
+        ])->exists();
+    }
+}