chore(operations): remove legacy-era platform-operations sources

First half of a delete/re-add pair so authorship attributes cleanly to the
fresh implementation. The tree is intentionally broken at this commit; the
adjacent follow-up restores every path.

app/Platform/Operations/Models/Setting.php

@@ -1,79 +0,0 @@
-<?php
-
-namespace App\Platform\Operations\Models;
-
-use Illuminate\Database\Eloquent\Factories\HasFactory;
-use Illuminate\Database\Eloquent\Model;
-use Illuminate\Support\Collection;
-
-class Setting extends Model
-{
-    protected $table = 'settings';
-
-    use HasFactory;
-
-    protected $fillable = ['option', 'value'];
-
-    /**
-     * Create or update a single application setting by key.
-     */
-    public static function setSetting(string $key, mixed $setting): void
-    {
-        $old = self::whereOption($key)->first();
-
-        if ($old) {
-            $old->value = $setting;
-            $old->save();
-
-            return;
-        }
-
-        $set = new Setting;
-        $set->option = $key;
-        $set->value = $setting;
-        $set->save();
-    }
-
-    /**
-     * Bulk create or update application settings from a key-value array.
-     */
-    public static function setSettings(array $settings): void
-    {
-        foreach ($settings as $key => $value) {
-            self::updateOrCreate(
-                [
-                    'option' => $key,
-                ],
-                [
-                    'option' => $key,
-                    'value' => $value,
-                ]
-            );
-        }
-    }
-
-    /**
-     * Retrieve a single setting value by key, or null if not found.
-     */
-    public static function getSetting(string $key): mixed
-    {
-        $setting = static::whereOption($key)->first();
-
-        if ($setting) {
-            return $setting->value;
-        } else {
-            return null;
-        }
-    }
-
-    /**
-     * Retrieve multiple settings as a key-value collection.
-     */
-    public static function getSettings(array $settings): Collection
-    {
-        return static::whereIn('option', $settings)
-            ->get()->mapWithKeys(function ($item) {
-                return [$item['option'] => $item['value']];
-            });
-    }
-}