feat(issues): notificaciones, plantillas de checklist, alertas de vencimiento y reporte desde el mapa

- Notificaciones (DB): asignación de incidencia (IssueAssigned), asignación de tarea
  (IssueTaskAssigned), comentario (IssueCommented) y cambio de estado
  (IssueStatusChanged) a reporter+asignado excluyendo al actor.
- Plantillas de checklist: tabla issue_checklist_templates + modelo, gestor CRUD
  (IssueChecklistManager, ruta projects.issues.checklists) y "Aplicar plantilla" en
  el detalle (alta masiva de tareas).
- Alertas de vencimiento: columna overdue_notified_at + scope overdue, comando
  issues:notify-overdue (programado a diario) que avisa al asignado una sola vez;
  badge "vencidas" en la tabla y resaltado por tarea en el detalle.
- Reporte desde el mapa: botón "Incidencia" en el panel del feature seleccionado →
  formulario con feature pre-vinculado (IssueForm lee ?feature=).

Tests: IssuesEnhancementsTest (7). Suite 57 passing (solo 2 pre-existentes sqlite).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/Notifications/IssueAssignedNotification.php

@@ -0,0 +1,30 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\Issue;
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Notification;
+
+class IssueAssignedNotification extends Notification
+{
+    use Queueable;
+
+    public function __construct(public Issue $issue) {}
+
+    public function via($notifiable): array
+    {
+        return ['database'];
+    }
+
+    public function toArray($notifiable): array
+    {
+        return [
+            'type'       => 'issue_assigned',
+            'issue_id'   => $this->issue->id,
+            'project_id' => $this->issue->project_id,
+            'priority'   => $this->issue->priority,
+            'message'    => "Se te ha asignado la incidencia '{$this->issue->title}'",
+        ];
+    }
+}

app/Notifications/IssueCommentedNotification.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\IssueComment;
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Notification;
+use Illuminate\Support\Str;
+
+class IssueCommentedNotification extends Notification
+{
+    use Queueable;
+
+    public function __construct(public IssueComment $comment) {}
+
+    public function via($notifiable): array
+    {
+        return ['database'];
+    }
+
+    public function toArray($notifiable): array
+    {
+        $issue = $this->comment->issue;
+
+        return [
+            'type'       => 'issue_commented',
+            'issue_id'   => $this->comment->issue_id,
+            'project_id' => $issue?->project_id,
+            'author'     => $this->comment->user?->name,
+            'message'    => "{$this->comment->user?->name} comentó en '{$issue?->title}': " . Str::limit($this->comment->body, 60),
+        ];
+    }
+}

app/Notifications/IssueStatusChangedNotification.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\Issue;
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Notification;
+
+class IssueStatusChangedNotification extends Notification
+{
+    use Queueable;
+
+    public function __construct(public Issue $issue, public string $status) {}
+
+    public function via($notifiable): array
+    {
+        return ['database'];
+    }
+
+    public function toArray($notifiable): array
+    {
+        $label = [
+            'open'      => 'reabierta',
+            'in_review' => 'enviada a revisión',
+            'resolved'  => 'resuelta',
+            'closed'    => 'cerrada',
+        ][$this->status] ?? $this->status;
+
+        return [
+            'type'       => 'issue_status_changed',
+            'issue_id'   => $this->issue->id,
+            'project_id' => $this->issue->project_id,
+            'status'     => $this->status,
+            'message'    => "La incidencia '{$this->issue->title}' ha sido {$label}",
+        ];
+    }
+}

app/Notifications/IssueTaskAssignedNotification.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\IssueTask;
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Notification;
+
+class IssueTaskAssignedNotification extends Notification
+{
+    use Queueable;
+
+    public function __construct(public IssueTask $task) {}
+
+    public function via($notifiable): array
+    {
+        return ['database'];
+    }
+
+    public function toArray($notifiable): array
+    {
+        return [
+            'type'       => 'issue_task_assigned',
+            'issue_id'   => $this->task->issue_id,
+            'task_id'    => $this->task->id,
+            'project_id' => $this->task->issue?->project_id,
+            'due_date'   => $this->task->due_date?->toDateString(),
+            'message'    => "Se te ha asignado la tarea '{$this->task->title}'",
+        ];
+    }
+}

app/Notifications/IssueTaskOverdueNotification.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Notifications;
+
+use App\Models\IssueTask;
+use Illuminate\Bus\Queueable;
+use Illuminate\Notifications\Notification;
+
+class IssueTaskOverdueNotification extends Notification
+{
+    use Queueable;
+
+    public function __construct(public IssueTask $task) {}
+
+    public function via($notifiable): array
+    {
+        return ['database'];
+    }
+
+    public function toArray($notifiable): array
+    {
+        return [
+            'type'       => 'issue_task_overdue',
+            'issue_id'   => $this->task->issue_id,
+            'task_id'    => $this->task->id,
+            'project_id' => $this->task->issue?->project_id,
+            'due_date'   => $this->task->due_date?->toDateString(),
+            'message'    => "Tarea vencida: '{$this->task->title}' (venció el {$this->task->due_date?->format('d/m/Y')})",
+        ];
+    }
+}