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>

app/Data/CoolifyTaskArgs.php

@@ -1,30 +0,0 @@
-<?php
-
-namespace App\Data;
-
-use App\Enums\ProcessStatus;
-use Illuminate\Database\Eloquent\Model;
-use Spatie\LaravelData\Data;
-
-/**
- * The parameters to execute a CoolifyTask, organized in a DTO.
- */
-class CoolifyTaskArgs extends Data
-{
-    public function __construct(
-        public string $server_uuid,
-        public string $command,
-        public string $type,
-        public ?string $type_uuid = null,
-        public ?int $process_id = null,
-        public ?Model $model = null,
-        public ?string $status = null,
-        public bool $ignore_errors = false,
-        public $call_event_on_finish = null,
-        public $call_event_data = null
-    ) {
-        if (is_null($status)) {
-            $this->status = ProcessStatus::QUEUED->value;
-        }
-    }
-}