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/Http/Admin/SettingsController.php

@@ -1,35 +0,0 @@
-<?php
-
-namespace App\Platform\Operations\Http\Admin;
-
-use App\Platform\Http\Controller;
-use App\Platform\Operations\Http\Requests\GetSettingRequest;
-use App\Platform\Operations\Http\Requests\SettingRequest;
-use App\Platform\Operations\Models\Setting;
-use Illuminate\Http\JsonResponse;
-
-class SettingsController extends Controller
-{
-    public function show(GetSettingRequest $request): JsonResponse
-    {
-        $this->authorize('manage settings');
-
-        $setting = Setting::getSetting($request->key);
-
-        return response()->json([
-            $request->key => $setting,
-        ]);
-    }
-
-    public function update(SettingRequest $request): JsonResponse
-    {
-        $this->authorize('manage settings');
-
-        Setting::setSettings($request->settings);
-
-        return response()->json([
-            'success' => true,
-            $request->settings,
-        ]);
-    }
-}