Feat: Назначения курсов с tags-input

✅ CourseAssignmentController (index, create, store)
✅ create.blade.php с тремя tags-input (пользователи/группы/организации)
✅ Разные цвета бейджей (зелёный/голубой/синий)
✅ UserSearchController API
✅ index.blade.php список назначений

Co-authored-by: Qwen-Coder <qwen-coder@alibabacloud.com>

app/Http/Controllers/Api/UserSearchController.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Http\Controllers\Api;
+
+use App\Http\Controllers\Controller;
+use App\Models\User;
+use Illuminate\Http\Request;
+
+class UserSearchController extends Controller
+{
+    public function __invoke(Request $request)
+    {
+        $query = $request->get('q', '');
+        
+        $users = User::query()
+            ->with('organization')
+            ->where('name', 'like', "%{$query}%")
+            ->orWhere('email', 'like', "%{$query}%")
+            ->orderBy('name')
+            ->limit(50)
+            ->get()
+            ->map(function($user) {
+                return [
+                    'id' => $user->id,
+                    'text' => $user->name . ($user->organization ? " ({$user->organization->name})" : ''),
+                ];
+            });
+        
+        return response()->json($users);
+    }
+}