feat: Add User-Agent header to Allegro API requests

- Implemented buildUserAgent() method in AllegroApiClient, AllegroOAuthClient, and AllegroTrackingService to include User-Agent header in all HTTP requests to Allegro API.
- Updated .env.example to include APP_VERSION and ALLEGRO_USER_AGENT_URL for configuration.
- Created public /info page to provide application details required by Allegro, including app name, version, description, and contact information.
- Added minimalist layout for public pages to ensure a professional appearance.
- Ensured all changes comply with Allegro's API requirements for User-Agent header.

.vscode/ftp-kr.sync.cache.json

@@ -2164,8 +2164,8 @@
             },
             "show.php": {
               "type": "-",
-              "size": 52009,
-              "lmtime": 1775559290158,
+              "size": 53047,
+              "lmtime": 1775665227986,
               "modified": false
             }
           },
@@ -2360,8 +2360,8 @@
       "routes": {
         "web.php": {
           "type": "-",
-          "size": 28970,
-          "lmtime": 1775589926446,
+          "size": 29085,
+          "lmtime": 1775665188561,
           "modified": false
         }
       },
@@ -3238,15 +3238,15 @@
             },
             "ShipmentController.php": {
               "type": "-",
-              "size": 20200,
-              "lmtime": 1774285889068,
-              "modified": true
+              "size": 22456,
+              "lmtime": 1775665182684,
+              "modified": false
             },
             "ShipmentPackageRepository.php": {
               "type": "-",
-              "size": 8836,
-              "lmtime": 1774296780272,
-              "modified": true
+              "size": 9053,
+              "lmtime": 1775665162030,
+              "modified": false
             },
             "ShipmentPresetController.php": {
               "type": "-",