Add optional Tone field to Sites for AI content generation

- Add tone column to sites table (nullable string)
- Add TONES constant to Site model with predefined options:
  professional, casual, technical, friendly, formal, humorous,
  conversational, authoritative, inspirational, educational, minimal, detailed
- Update Sites Livewire component to edit tone
- Update Sites view with tone select dropdown in form
- Add tone column to sites table display
- Add tone to SiteResource API response

AI agents can now read the site's tone and use it when generating content.

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

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

@@ -11,6 +11,7 @@
                 <th class="p-3">URL</th>
                 <th class="p-3">Description</th>
                 <th class="p-3">CMS Type</th>
+                <th class="p-3">Tone</th>
                 <th class="p-3"></th>
             </tr>
         </thead>
@@ -38,6 +39,13 @@
                             <div class="text-xs text-gray-500" title="{{ $site->api_instructions }}">Has API instructions</div>
                         @endif
                     </td>
+                    <td class="p-3">
+                        @if ($site->tone)
+                            <span class="text-xs bg-purple-100 text-purple-800 px-2 py-0.5 rounded">{{ $site->tone }}</span>
+                        @else
+                            <span class="text-gray-400">—</span>
+                        @endif
+                    </td>
                     <td class="p-3 text-right space-x-2">
                         <button wire:click="edit({{ $site->id }})" class="text-blue-600">Edit</button>
                         <button wire:click="delete({{ $site->id }})" wire:confirm="Delete this site?" class="text-red-600">Delete</button>
@@ -69,6 +77,20 @@
                     <textarea wire:model="description" class="w-full border rounded p-2"></textarea>
                 </div>
 
+                <div>
+                    <label class="block text-sm font-medium">Tone (optional for AI)</label>
+                    <select wire:model="tone" class="w-full border rounded p-2">
+                        <option value="">No tone specified</option>
+                        @foreach ($tones as $t)
+                            <option value="{{ $t }}">{{ ucfirst($t) }}</option>
+                        @endforeach
+                    </select>
+                    <p class="text-xs text-gray-500 mt-1">
+                        Writing style for AI-generated content (e.g., professional, casual, technical).
+                    </p>
+                    @error('tone') <span class="text-red-600 text-sm">{{ $message }}</span> @enderror
+                </div>
+
                 <div>
                     <label class="block text-sm font-medium">CMS Type</label>
                     <select wire:model.live="cmsType" class="w-full border rounded p-2">