chore: project cleanup - remove unused dependencies and routes

- Remove unused axios package and 22 dependencies
- Fix 2 moderate npm security vulnerabilities
- Remove test route /test-zweite-db (no longer needed)
- Remove unused DB facade import from routes/web.php

This cleanup reduces bundle size and improves maintainability.

routes/web.php

@@ -1,6 +1,5 @@
 <?php
 
-use Illuminate\Support\Facades\DB;
 use Illuminate\Support\Facades\Route;
 use Laravel\Fortify\Features;
 use Livewire\Volt\Volt;
@@ -9,24 +8,6 @@ Route::get('/', function () {
     return view('welcome');
 })->name('home');
 
-// Test Route für PGSQL - kann beliebig abgeändert werden (zum Testen)
-Route::get('/test-zweite-db', function () {
-    try {
-        // Eine einfache Abfrage auf der zweiten Verbindung
-        $result = DB::connection('pgsql_second')->select('SELECT NOW() as current_time');
-
-        return response()->json([
-            'status' => 'Erfolgreich verbunden mit zweiter Datenbank',
-            'zeitstempel' => $result[0]->current_time,
-        ]);
-    } catch (\Exception $e) {
-        return response()->json([
-            'status' => 'Fehler bei der Verbindung',
-            'meldung' => $e->getMessage(),
-        ], 500);
-    }
-});
-
 Route::view('dashboard', 'dashboard')
     ->middleware(['auth', 'verified'])
     ->name('dashboard');