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)

composer.json

@@ -18,6 +18,7 @@
         "maatwebsite/excel": "*",
         "mansoor/blade-lets-icons": "^1.0",
         "phayes/geophp": "^1.2",
+        "predis/predis": "^1.1",
         "rappasoft/laravel-livewire-tables": "^3.7",
         "spatie/laravel-permission": "^6.25"
     },