feat(infra): add scheduler and worker-generate standalone processes

Extract monitoring recovery/inspection workers and schedule dispatch
into a dedicated scheduler process. Add worker-generate process for
article generation and template-assist queue consumption. Introduce
shared/schedule runtime for cron-based worker lifecycle management.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

server/internal/scheduler/knowledge_deleted_cleanup_worker.go

@@ -0,0 +1,43 @@
+package scheduler
+
+import (
+	"context"
+	"time"
+
+	tenantapp "github.com/geo-platform/tenant-api/internal/tenant/app"
+)
+
+type KnowledgeDeletedCleanupWorker struct {
+	service  *tenantapp.KnowledgeService
+	interval time.Duration
+}
+
+func NewKnowledgeDeletedCleanupWorker(service *tenantapp.KnowledgeService) *KnowledgeDeletedCleanupWorker {
+	return &KnowledgeDeletedCleanupWorker{
+		service:  service,
+		interval: 15 * time.Second,
+	}
+}
+
+func (w *KnowledgeDeletedCleanupWorker) Start(ctx context.Context) {
+	if w == nil || w.service == nil {
+		return
+	}
+	go w.run(ctx)
+}
+
+func (w *KnowledgeDeletedCleanupWorker) run(ctx context.Context) {
+	w.service.RunDeletedCleanupSweep()
+
+	ticker := time.NewTicker(w.interval)
+	defer ticker.Stop()
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case <-ticker.C:
+			w.service.RunDeletedCleanupSweep()
+		}
+	}
+}