fix: shortlink generation logic update/create

test/http/register-flow.http

@@ -79,12 +79,12 @@ Content-Type: application/json
 
 {
   "email": "expert@example.com",
-  "password": "expert123",
-  "name": "Dr. Expert Johnson",
+  "password": "password123",
+  "name": "Dr. Expertise",
   "role": "expertise_doctor",
   "doctor": {
     "doctor_id": "EX456",
-    "doctor_name": "Dr. Expert Johnson"
+    "doctor_name": "Dr. Expertise"
   }
 }
 
@@ -109,7 +109,7 @@ Content-Type: application/json
 
 {
   "email": "admin@example.com",
-  "password": "admin123",
+  "password": "password123",
   "name": "Admin User",
   "role": "admin"
 }
@@ -148,4 +148,12 @@ Content-Type: application/json
 {
   "email": "doctor@example.com",
   "password": "password123"
+}
+
+### Refresh TOken
+POST {{baseUrl}}/auth/refresh
+Content-Type: application/json
+
+{
+  "refresh_token": {{ refresh_token}}
 }