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)

app/Livewire/Projects/ProjectMap.php

@@ -109,7 +109,7 @@ class ProjectMap extends Component
         $this->authorizeProjectAccess();
 
         $this->phases = $project->phases()->with([
-            'layers' => fn ($q) => $q->withCount('features'),
+            'layers' => fn ($q) => $q->withCount('features')->with(['features.template', 'features.images']),
             'layers.features',
             'layers.features.images',
         ])->get();
@@ -124,7 +124,7 @@ class ProjectMap extends Component
 
         $this->allFeatures = Feature::whereHas('layer.phase', function ($q) use ($project) {
             $q->where('project_id', $project->id);
-        })->with(['layer.phase', 'template'])->get();
+        })->with(['layer.phase', 'template', 'images'])->get();
 
         $this->allInspections = Inspection::where('project_id', $project->id)
             ->with(['feature.layer.phase', 'template', 'user'])