Stand: SMTP-Test, Admin-Mail-Tab, Notifiable-Fix, Lazy-Quill

- Fix: Notifiable-Trait zum User-Model hinzugefuegt (behebt notify()-500er)
- Installer: SMTP-Verbindungstest mit EsmtpTransport + Ueberspringen-Link
- Admin: Neuer E-Mail-Tab mit SMTP-Konfiguration + Verbindungstest
- Admin: Lazy Quill-Initialisierung (nur sichtbare Locale wird geladen)
- Uebersetzungen: 17 neue Mail-Keys in allen 6 Sprachen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/0003_01_01_000000_create_players_table.php

@@ -0,0 +1,29 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('players', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('team_id')->constrained('teams')->restrictOnDelete();
+            $table->string('first_name', 100);
+            $table->string('last_name', 100);
+            $table->unsignedSmallInteger('birth_year')->nullable();
+            $table->unsignedSmallInteger('jersey_number')->nullable();
+            $table->boolean('is_active')->default(true);
+            $table->boolean('photo_permission')->default(false);
+            $table->text('notes')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('players');
+    }
+};