The goal of this observational study is to develop an integrated clinical-molecular risk stratification to identifypatients who are at high risk of recurrence and who would benefit from adjuvant chemotherapy in patients with recectable colorectal liver metastases. The main question it aims to answer is: can the integration of multi-dimensional data-including ctDNA, driver gene profiles, and clinical factors-accurately identify postoperative patients at high risk of recurrence and guide personalized adjuvant therapy strategies?