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>

routes/web.php

@@ -4,6 +4,7 @@ use App\Livewire\Auth\Login;
 use App\Livewire\Posts\Index as PostsIndex;
 use App\Livewire\Sites\Index as SitesIndex;
 use App\Livewire\SocialAccounts\Index as SocialAccountsIndex;
+use App\Livewire\Templates\Index as TemplatesIndex;
 use Illuminate\Support\Facades\Auth;
 use Illuminate\Support\Facades\Route;
 
@@ -25,4 +26,5 @@ Route::middleware('auth')->group(function () {
     Route::get('/sites', SitesIndex::class)->name('sites.index');
     Route::get('/social-accounts', SocialAccountsIndex::class)->name('social-accounts.index');
     Route::get('/posts', PostsIndex::class)->name('posts.index');
+    Route::get('/templates', TemplatesIndex::class)->name('templates.index');
 });