refactor: simplify remote process chain and harden ActivityMonitor

- Inline PrepareCoolifyTask and CoolifyTaskArgs into remote_process(),
  removing two single-consumer abstraction layers
- Add #[Locked] attribute to ActivityMonitor $activityId property
- Add team ownership verification in ActivityMonitor.hydrateActivity()
  with server_uuid fallback and fail-closed default
- Store team_id in activity properties for proper scoping
- Update CLAUDE.md to remove stale reference
- Add comprehensive tests for activity monitor authorization

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

resources/views/livewire/activity-monitor.blade.php

@@ -34,10 +34,10 @@
             }
         }" x-init="// Initial scroll
         $nextTick(() => scrollToBottom());
-        
+
         // Add scroll event listener
         $el.addEventListener('scroll', () => handleScroll());
-        
+
         // Set up mutation observer to watch for content changes
         observer = new MutationObserver(() => {
             $nextTick(() => scrollToBottom());