feat(tasks): complete task management system with Kanban, Calendar, notifications

- Add Task model with subtasks, priorities, status transitions, dates, hours
- Add Comment polymorphic model for tasks/issues/projects
- Livewire components: TaskManager (list+filters), TaskForm (modal), TaskDetail, TaskKanban (drag&drop), TaskCalendar (FullCalendar)
- TaskPolicy with permissions (view/create/edit/delete/assign/manage all)
- Notifications: assigned, status change, overdue, comment added
- Daily overdue notification job scheduled
- Dashboard widget unifies IssueTask + Task
- i18n: en/es/fr/ru (393 keys each)
- Routes, navigation, offline sync support
- 101 tests passing, Pint compliant on new files

app/Providers/AppServiceProvider.php

@@ -2,8 +2,10 @@
 
 namespace App\Providers;
 
-use Illuminate\Support\ServiceProvider;
+use App\Models\Task;
+use App\Policies\TaskPolicy;
 use Illuminate\Support\Facades\Gate;
+use Illuminate\Support\ServiceProvider;
 
 class AppServiceProvider extends ServiceProvider
 {
@@ -20,6 +22,9 @@ class AppServiceProvider extends ServiceProvider
      */
     public function boot(): void
     {
+        // Register policies
+        Gate::policy(Task::class, TaskPolicy::class);
+
         // Super-admin bypass: anyone with the "manage all" permission
         // (the Admin role has it) passes every authorization check.
         // Return true to allow, or null to let normal checks run — never false.