fix(lampiran-dokumen): perbaiki respons upload dan delete lampiran

- Mengubah respons dari JSON menjadi redirect dengan pesan sukses atau error.
- Menambahkan konfirmasi sebelum menghapus lampiran untuk pengguna dengan peran administrator.
- Memperbaiki tampilan link download dan view lampiran agar lebih terstruktur.

app/Http/Controllers/LampiranDokumenController.php

@@ -27,18 +27,18 @@
             $lampiran = LampiranDokumen::uploadLampiran($request->all());
 
             if ($lampiran) {
-                return response()->json(['message' => 'Lampiran uploaded successfully', 'data' => $lampiran]);
+                return redirect()->back()->with('success', 'Lampiran uploaded successfully');
             } else {
-                return response()->json(['message' => 'Unauthorized or upload failed'], 403);
+                return redirect()->back()->with('error', 'Unauthorized or upload failed');
             }
         }
 
         public function delete(LampiranDokumen $lampiran)
         {
             if ($lampiran->deleteLampiran()) {
-                return response()->json(['message' => 'Lampiran deleted successfully']);
+                return redirect()->back()->with('success', 'Lampiran deleted successfully');
             } else {
-                return response()->json(['message' => 'Unauthorized or delete failed'], 403);
+                return redirect()->back()->with('error', 'Unauthorized or delete failed');
             }
         }
     }