Refactor task audits, integrate OpenClaw, and fix timezone handling

backend/main.py

@@ -201,6 +201,24 @@ async def create_task(task: schemas.TaskCreate, db: Session = Depends(get_db), c
     
     db.commit()
     db.refresh(db_task)
+
+    # Create audit log entry
+    assignee_name = "Unassigned"
+    if db_task.assignee_id:
+        assignee = db.query(models.User).filter(models.User.id == db_task.assignee_id).first()
+        if assignee:
+            assignee_name = assignee.name
+
+    db_audit = models.AuditLog(
+        id=f"al_{uuid.uuid4().hex[:8]}",
+        actor=current_user.id,
+        action='task_created',
+        summary=f'Created task "{db_task.title}" for {assignee_name}',
+        target=db_task.id
+    )
+    db.add(db_audit)
+    db.commit()
+
     await manager.broadcast(json.dumps({"type": "refresh"}))
     return db_task