restructure retribution calculations table

app/Models/RetributionConfig.php

@@ -0,0 +1,50 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class RetributionConfig extends Model
+{
+    protected $fillable = [
+        'key',
+        'value',
+        'description',
+        'is_active'
+    ];
+
+    protected $casts = [
+        'value' => 'decimal:2',
+        'is_active' => 'boolean'
+    ];
+
+    /**
+     * Get config value by key
+     */
+    public static function getValue(string $key, float $default = 0.0): float
+    {
+        $config = self::where('key', $key)->where('is_active', true)->first();
+        return $config ? (float) $config->value : $default;
+    }
+
+    /**
+     * Get all active configs as array
+     */
+    public static function getAllActive(): array
+    {
+        return self::where('is_active', true)
+            ->pluck('value', 'key')
+            ->toArray();
+    }
+
+    /**
+     * Update config value
+     */
+    public static function updateValue(string $key, float $value): bool
+    {
+        return self::updateOrCreate(
+            ['key' => $key],
+            ['value' => $value, 'is_active' => true]
+        );
+    }
+}