Add email templates, page layouts, and shop themes (template system)

- E-Mail-Templates: DB-gespeicherte HTML-Templates mit {{placeholder}}-System,
  Admin-UI zum Bearbeiten von Betreff und Body, alle 4 Mailables aktualisiert
- Seiten-Layouts: 4 Layouts für CMS-Seiten (Standard, Sidebar, Volle Breite, Landing),
  Layout-Auswahl im Admin-Formular
- Shop-Themes: 5 Farbthemen via CSS-Variablen, Picker in Einstellungen
- Deployment: EmailTemplateSeeder wird automatisch beim Deploy ausgeführt

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

resources/views/layouts/shop.blade.php

@@ -6,6 +6,33 @@
     <title>@yield('title', \App\Models\Setting::get('shop_name', 'Shop'))</title>
     <meta name="description" content="@yield('meta_description', '')">
     @vite(['resources/css/app.css', 'resources/js/app.js'])
+    @php
+        $themes    = config('themes');
+        $themeName = \App\Models\Setting::get('theme_name', 'default');
+        $theme     = $themes[$themeName] ?? $themes['default'];
+    @endphp
+    <style>
+        :root {
+            --primary:       {{ $theme['primary'] }};
+            --primary-dark:  {{ $theme['dark'] }};
+            --primary-light: {{ $theme['light'] }};
+            --primary-text:  {{ $theme['text'] }};
+        }
+        .btn-primary        { background-color: var(--primary); color: #fff; }
+        .btn-primary:hover  { background-color: var(--primary-dark); }
+        .text-primary       { color: var(--primary); }
+        .bg-primary         { background-color: var(--primary); }
+        .bg-primary-dark    { background-color: var(--primary-dark); }
+        .bg-primary-light   { background-color: var(--primary-light); }
+        .border-primary     { border-color: var(--primary); }
+        .hover-primary:hover { background-color: var(--primary-light); color: var(--primary-text); }
+        .cat-bar            { background-color: var(--primary); }
+        .cat-bar a          { color: rgba(255,255,255,0.85); }
+        .cat-bar a:hover    { background-color: var(--primary-dark); color: #fff; }
+        .cat-bar a.active   { background-color: var(--primary-dark); color: #fff; }
+        .cart-badge         { color: var(--primary); }
+        .shop-name-text     { color: var(--primary); }
+    </style>
 </head>
 <body class="bg-gray-50 text-gray-800 flex flex-col min-h-screen">
 
@@ -15,7 +42,7 @@
         <p class="text-sm">Wir verwenden Cookies, um Ihnen die bestmögliche Nutzererfahrung zu bieten. Mit dem Klick auf „Akzeptieren" stimmen Sie der Verwendung aller Cookies zu. <a href="{{ route('page', 'datenschutz') }}" class="underline">Mehr erfahren</a></p>
         <div class="flex gap-2 shrink-0">
             <button onclick="setCookieConsent(false)" class="px-4 py-2 text-sm border border-gray-500 rounded hover:bg-gray-700">Ablehnen</button>
-            <button onclick="setCookieConsent(true)" class="px-4 py-2 text-sm bg-blue-500 rounded hover:bg-blue-600">Akzeptieren</button>
+            <button onclick="setCookieConsent(true)" class="px-4 py-2 text-sm btn-primary rounded">Akzeptieren</button>
         </div>
     </div>
     <script>
@@ -27,73 +54,73 @@
     @endif
 
     @php
-        $legalSlugs  = ['impressum','datenschutz','agb','widerrufsbelehrung'];
-        $navPages    = \App\Models\Page::where('published', true)
-                           ->where('show_in_nav', true)
-                           ->orderBy('nav_sort')
-                           ->orderBy('title')
-                           ->get();
+        $legalSlugs    = ['impressum','datenschutz','agb','widerrufsbelehrung'];
+        $navPages      = \App\Models\Page::where('published', true)
+                             ->where('show_in_nav', true)
+                             ->orderBy('nav_sort')
+                             ->orderBy('title')
+                             ->get();
         $navCategories = \App\Models\Category::whereNull('parent_id')
-                           ->where('active', true)
-                           ->where('show_in_nav', true)
-                           ->orderBy('sort_order')
-                           ->get();
+                             ->where('active', true)
+                             ->where('show_in_nav', true)
+                             ->orderBy('sort_order')
+                             ->get();
     @endphp
 
     {{-- Header: Logo-Leiste --}}
     <header class="bg-white border-b shadow-sm">
         <div class="max-w-6xl mx-auto px-4 py-3 flex items-center justify-between gap-4">
 
-            {{-- Logo: Bild (wenn hinterlegt) oder Shop-Name als Text --}}
+            {{-- Logo --}}
             <a href="{{ url('/') }}" class="shrink-0 flex items-center">
                 @php $logo = \App\Models\Setting::get('shop_logo'); @endphp
                 @if($logo)
                     <img src="{{ asset('storage/'.$logo) }}" alt="{{ \App\Models\Setting::get('shop_name', 'Shop') }}" class="h-12 w-auto object-contain">
                 @else
-                    <span class="text-2xl font-bold text-blue-700 tracking-tight">
+                    <span class="text-2xl font-bold tracking-tight shop-name-text">
                         {{ \App\Models\Setting::get('shop_name', 'Shop') }}
                     </span>
                 @endif
             </a>
 
-            {{-- Haupt-Navigation rechts --}}
+            {{-- Haupt-Navigation --}}
             <nav class="flex items-center gap-1">
                 <a href="{{ route('shop.products.index') }}"
-                   class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition">
+                   class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition">
                     Alle Produkte
                 </a>
                 @foreach($navCategories as $navCat)
                 <a href="{{ route('shop.category', $navCat->slug) }}"
-                   class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition
-                          {{ request()->route('slug') === $navCat->slug ? 'bg-blue-50 text-blue-700' : '' }}">
+                   class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition
+                          {{ request()->route('slug') === $navCat->slug ? 'bg-primary-light text-primary-text' : '' }}">
                     {{ $navCat->name }}
                 </a>
                 @endforeach
                 @foreach($navPages as $navPage)
                 <a href="{{ route('page', $navPage->slug) }}"
-                   class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition
-                          {{ request()->route('slug') === $navPage->slug ? 'bg-blue-50 text-blue-700' : '' }}">
+                   class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition
+                          {{ request()->route('slug') === $navPage->slug ? 'bg-primary-light text-primary-text' : '' }}">
                     {{ $navPage->title }}
                 </a>
                 @endforeach
                 @auth
                     <a href="{{ route('account.index') }}"
-                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition">
+                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition">
                         Mein Konto
                     </a>
                     @if(auth()->user()->isAdmin())
                     <a href="{{ route('admin.dashboard') }}"
-                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition">
+                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition">
                         Admin
                     </a>
                     @endif
                 @else
                     <a href="{{ route('login') }}"
-                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition">
+                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition">
                         Anmelden
                     </a>
                     <a href="{{ route('register') }}"
-                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover:bg-blue-50 hover:text-blue-700 transition">
+                       class="px-3 py-2 rounded-lg text-sm font-medium text-gray-700 hover-primary transition">
                         Registrieren
                     </a>
                 @endauth
@@ -108,14 +135,14 @@
                 </a>
 
                 <a href="{{ route('cart.index') }}"
-                   class="relative ml-2 px-3 py-2 rounded-lg text-sm font-medium bg-blue-700 text-white hover:bg-blue-800 transition flex items-center gap-1.5">
+                   class="relative ml-2 px-3 py-2 rounded-lg text-sm font-medium btn-primary transition flex items-center gap-1.5">
                     <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                         <path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 3h2l.4 2M7 13h10l4-8H5.4M7 13L5.4 5M7 13l-2.293 2.293c-.63.63-.184 1.707.707 1.707H17m0 0a2 2 0 100 4 2 2 0 000-4zm-8 2a2 2 0 11-4 0 2 2 0 014 0z"/>
                     </svg>
                     Warenkorb
                     @php $cartCount = array_sum(array_column(session('cart', []), 'qty')); @endphp
                     @if($cartCount > 0)
-                        <span class="bg-white text-blue-700 text-xs font-bold rounded-full w-5 h-5 flex items-center justify-center leading-none">{{ $cartCount }}</span>
+                        <span class="bg-white cart-badge text-xs font-bold rounded-full w-5 h-5 flex items-center justify-center leading-none">{{ $cartCount }}</span>
                     @endif
                 </a>
             </nav>
@@ -124,12 +151,12 @@
         {{-- Kategorien-Navigation --}}
         @php $navCats = \App\Models\Category::whereNull('parent_id')->where('active', true)->orderBy('sort_order')->get(); @endphp
         @if($navCats->count())
-        <div class="bg-blue-700">
+        <div class="cat-bar">
             <div class="max-w-6xl mx-auto px-4 flex gap-1 overflow-x-auto">
                 @foreach($navCats as $cat)
                 <a href="{{ route('shop.category', $cat->slug) }}"
-                   class="whitespace-nowrap px-4 py-2.5 text-sm font-medium text-blue-100 hover:text-white hover:bg-blue-600 transition
-                          {{ request()->route('slug') === $cat->slug ? 'bg-blue-800 text-white' : '' }}">
+                   class="whitespace-nowrap px-4 py-2.5 text-sm font-medium transition
+                          {{ request()->route('slug') === $cat->slug ? 'active' : '' }}">
                     {{ $cat->name }}
                 </a>
                 @endforeach
@@ -154,20 +181,20 @@
 
     {{-- Footer --}}
     @php
-        $footerPages  = \App\Models\Page::where('published', true)
-                            ->where('type', 'static')
-                            ->where('show_in_footer', true)
-                            ->whereNotIn('slug', $legalSlugs)
-                            ->orderBy('title')
-                            ->get();
-        $legalPages   = \App\Models\Page::where('published', true)
-                            ->where('type', 'static')
-                            ->whereIn('slug', $legalSlugs)
-                            ->get()
-                            ->sortBy(fn($p) => array_search($p->slug, $legalSlugs))
-                            ->values();
-        $hasBlog      = \App\Models\Page::where('type','blog')->where('published', true)->exists();
-        $hasFaq       = \App\Models\Faq::exists();
+        $footerPages = \App\Models\Page::where('published', true)
+                           ->where('type', 'static')
+                           ->where('show_in_footer', true)
+                           ->whereNotIn('slug', $legalSlugs)
+                           ->orderBy('title')
+                           ->get();
+        $legalPages  = \App\Models\Page::where('published', true)
+                           ->where('type', 'static')
+                           ->whereIn('slug', $legalSlugs)
+                           ->get()
+                           ->sortBy(fn($p) => array_search($p->slug, $legalSlugs))
+                           ->values();
+        $hasBlog     = \App\Models\Page::where('type','blog')->where('published', true)->exists();
+        $hasFaq      = \App\Models\Faq::exists();
     @endphp
     <footer class="bg-gray-900 text-gray-400 text-sm mt-12">
         <div class="max-w-6xl mx-auto px-4 py-8 grid grid-cols-2 md:grid-cols-4 gap-6">