fix: change image URL input type to text for relative paths

The media library returns relative paths like /uploads/... which
don't pass HTML5 url validation. Changed to type="text" to accept
both full URLs and relative paths from the media library.

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

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

app/templates/admin/vendor-product-create.html

@@ -300,10 +300,10 @@
                     </button>
                     <p class="text-xs text-gray-500 dark:text-gray-400">Or enter URL directly:</p>
                     <input
-                        type="url"
+                        type="text"
                         x-model="form.primary_image_url"
                         class="w-64 px-3 py-2 text-sm border border-gray-300 dark:border-gray-600 rounded-lg focus:border-purple-400 focus:outline-none dark:bg-gray-700 dark:text-gray-300"
-                        placeholder="https://..."
+                        placeholder="https://... or /uploads/..."
                     />
                 </div>
             </div>

app/templates/admin/vendor-product-edit.html

@@ -276,10 +276,10 @@
                         <div>
                             <label class="block text-xs text-gray-500 dark:text-gray-400 mb-1">Or enter URL directly:</label>
                             <input
-                                type="url"
+                                type="text"
                                 x-model="form.primary_image_url"
                                 class="w-full px-3 py-2 text-sm border border-gray-300 dark:border-gray-600 rounded-lg focus:border-purple-400 focus:outline-none dark:bg-gray-700 dark:text-gray-300"
-                                placeholder="https://..."
+                                placeholder="https://... or /uploads/..."
                             />
                         </div>
                     </div>