fix(api): update ASSIGN_COMPANY_TO_CUSTOMER endpoint to remove redundant 'assign' path segment

src/lib/api/endpoints.ts

@@ -46,8 +46,7 @@ export const API_ENDPOINTS = {
     UPDATE: (id: string) => `customers/${id}`,
     DELETE: (id: string) => `customers/${id}`,
     DETAILS: (id: string) => `customers/${id}`,
-    ASSIGN_COMPANY_TO_CUSTOMER: (id: string) =>
-      `customers/${id}/companies/assign`,
+    ASSIGN_COMPANY_TO_CUSTOMER: (id: string) => `customers/${id}/companies`,
   },
   FEEDBACK: {
     READ_ALL: "feedback",