feat: Add SiteSettingController for site settings

app/Http/Controllers/SiteSettingController.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace App\Http\Controllers;
+
+use App\Models\SiteSetting;
+use Illuminate\Http\Request;
+use Illuminate\Support\Facades\Validator;
+
+class SiteSettingController extends Controller
+{
+    public function index()
+    {
+        $settings = SiteSetting::all();
+        return response()->json($settings);
+    }
+
+    public function edit($id)
+    {
+        $setting = SiteSetting::findOrFail($id);
+        return response()->json($setting);
+    }
+
+    public function update(Request $request, $id)
+    {
+        $validator = Validator::make($request->all(), [
+            'name' => 'required|string|max:255',
+            'value' => 'required|string',
+            'description' => 'nullable|string',
+        ]);
+
+        if ($validator->fails()) {
+            return response()->json($validator->errors(), 422);
+        }
+
+        $setting = SiteSetting::findOrFail($id);
+        $setting->update($request->all());
+        return response()->json($setting);
+    }
+
+    public function store(Request $request)
+    {
+        $validator = Validator::make($request->all(), [
+            'name' => 'required|string|max:255|unique:site_settings',
+            'value' => 'required|string',
+            'description' => 'nullable|string',
+        ]);
+
+        if ($validator->fails()) {
+            return response()->json($validator->errors(), 422);
+        }
+
+        $setting = SiteSetting::create($request->all());
+        return response()->json($setting, 201);
+    }
+}