feat: Phase 1 - Redis config, Dashboard cache, Report cache, N+1 fixes, observers

- Add predis/predis for Redis support
- Configure cache/queue defaults to redis in config + .env.example
- Create DashboardController with 60s cache for dashboard queries
- Add cache (5min) to ReportController::generate() and preview()
- Add FeatureObserver, InspectionObserver, IssueObserver for cache invalidation
- Fix N+1 in ProjectMap (eager load template, images), TaskManager (subtasks.parentTask)
- Register observers in AppServiceProvider

Tests: 101 passing (319 assertions)

routes/web.php

@@ -52,47 +52,13 @@ Route::get('/', function () {
     return redirect()->route('dashboard');
 })->middleware(['auth']);
 
+use App\Http\Controllers\DashboardController;
+
 // Grupo de rutas protegidas por autenticación
 Route::middleware(['auth'])->group(function () {
 
     // Home: vista ligera (proyectos, tareas e incidencias del usuario + notificaciones)
-    Route::get('/dashboard', function () {
-        $user = Auth::user();
-
-        $projects = Project::accessibleBy($user)
-            ->with(['phases' => fn ($q) => $q->select('id', 'project_id', 'progress_percent')])
-            ->orderBy('name')->take(8)->get();
-        $projectsCount = Project::accessibleBy($user)->count();
-
-        $myTasks = IssueTask::where('assigned_to', $user->id)
-            ->where('is_done', false)
-            ->with('issue.project')
-            ->orderByRaw('due_date IS NULL, due_date ASC')
-            ->take(8)->get();
-
-        $myTasksFromTasks = Task::where('assigned_to', $user->id)
-            ->where('status', '!=', 'completed')
-            ->with('project')
-            ->orderByRaw('due_date IS NULL, due_date ASC')
-            ->take(8)->get();
-
-        $myTasksCount = IssueTask::where('assigned_to', $user->id)->where('is_done', false)->count()
-            + Task::where('assigned_to', $user->id)->where('status', '!=', 'completed')->count();
-
-        $myIssues = Issue::where('assigned_to', $user->id)
-            ->whereIn('status', ['open', 'in_review'])
-            ->with('project')
-            ->latest()->take(6)->get();
-        $myIssuesCount = Issue::where('assigned_to', $user->id)->whereIn('status', ['open', 'in_review'])->count();
-
-        $notifications = $user->notifications()->latest()->take(6)->get();
-        $unreadCount = $user->unreadNotifications()->count();
-
-        return view('dashboard', compact(
-            'user', 'projects', 'projectsCount', 'myTasks', 'myTasksFromTasks', 'myTasksCount',
-            'myIssues', 'myIssuesCount', 'notifications', 'unreadCount'
-        ));
-    })->name('dashboard');
+    Route::get('/dashboard', [DashboardController::class, 'index'])->name('dashboard');
 
     Route::get('/reports/dashboard', ReportsDashboard::class)->name('reports.dashboard');
     Route::prefix('reports')->name('reports.')->group(function () {