fix(task): execute dispatched jobs and persist run records

Asynq func handlers now go through ProcessTask so admin execution
rows leave pending. The in-process worker resolves admin type
identifiers and writes the same w_task_executions table. Remove
the no-op admin system_cleanup that shadowed the upload handler.

backend/plugins/drivers/driver_inproc_worker/db_helper.go

@@ -0,0 +1,39 @@
+// Copyright 2026 Arctel.net
+// SPDX-License-Identifier: Apache-2.0
+
+package driver_inproc_worker
+
+import (
+	"Wavelet/core"
+	"Wavelet/core/contracts"
+	"context"
+	"sync"
+
+	"gorm.io/gorm"
+)
+
+var (
+	dbMu  sync.RWMutex
+	dbSvc contracts.DBService
+)
+
+func setDBService(s contracts.DBService) {
+	dbMu.Lock()
+	defer dbMu.Unlock()
+	dbSvc = s
+}
+
+func getDB(ctx context.Context) *gorm.DB {
+	if c, ok := ctx.(*core.Context); ok && c != nil {
+		if s, err := core.Inject[contracts.DBService](c); err == nil && s != nil {
+			return s.DB(ctx)
+		}
+	}
+	dbMu.RLock()
+	s := dbSvc
+	dbMu.RUnlock()
+	if s != nil {
+		return s.DB(ctx)
+	}
+	return nil
+}