Add Post Templates feature

- Create templates table with name, body, type, title, target, placeholders
- Add Template model with applyToPost method for placeholder replacement
- Add Livewire Templates/Index component for CRUD operations
- Add templates index view with form and table
- Add /templates route
- Update Posts/Index to support template selection when creating posts
- Templates can be applied to pre-fill post form fields

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

resources/views/livewire/posts/index.blade.php

@@ -63,6 +63,21 @@
             <div class="bg-white p-6 rounded w-full max-w-md space-y-4 max-h-[90vh] overflow-y-auto">
                 <h2 class="text-lg font-semibold">{{ $editingId ? 'Edit Post' : 'Add Post' }}</h2>
 
+                @if (count($templates) > 0 && !$editingId)
+                    <div>
+                        <label class="block text-sm font-medium">Template (optional)</label>
+                        <select wire:model.live="templateId" class="w-full border rounded p-2">
+                            <option value="">No template</option>
+                            @foreach ($templates as $template)
+                                <option value="{{ $template->id }}">{{ $template->name }} ({{ $template->type ? ucfirst($template->type) : 'any' }})</option>
+                            @endforeach
+                        </select>
+                        @if ($templateId)
+                            <button wire:click="applyTemplate" class="mt-2 text-sm text-blue-600">Apply Template</button>
+                        @endif
+                    </div>
+                @endif
+
                 <div>
                     <label class="block text-sm font-medium">Site</label>
                     <select wire:model="siteId" class="w-full border rounded p-2">