Add image upload support to document editor

- Create ImageUploadController to handle image uploads
- Store images in storage/app/public/images with UUID filenames
- Integrate with EasyMDE editor for drag-drop, paste, and toolbar upload
- Use original filename as alt text in markdown

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/routes/web.php

@@ -2,6 +2,7 @@
 
 use App\Http\Controllers\ProfileController;
 use App\Http\Controllers\LocaleController;
+use App\Http\Controllers\ImageUploadController;
 use App\Http\Controllers\Admin\UserController as AdminUserController;
 use App\Livewire\DocumentViewer;
 use App\Livewire\DocumentEditor;
@@ -29,6 +30,9 @@
     Route::get('/profile', [ProfileController::class, 'edit'])->name('profile.edit');
     Route::patch('/profile', [ProfileController::class, 'update'])->name('profile.update');
     Route::delete('/profile', [ProfileController::class, 'destroy'])->name('profile.destroy');
+
+    // Image upload for editor
+    Route::post('/images/upload', [ImageUploadController::class, 'upload'])->name('images.upload');
 });
 
 // Admin routes