CRP and Cognitive impairment: To evaluate the efficacy of intermittent theta-burst stimulation (iTBS) targeting the left dorsolateral prefrontal cortex (DLPFC) combined with cognitive training in patients with post-stroke cognitive impairment (PSCI), and to investigate its effects on systemic inflammatory biomarkers: homocysteine (Hcy), C-reactive protein (CRP), and lactate dehydrogenase (LDH).