fix(erpnext): serialize filters/fields as JSON in REST client; add mandatory appointment fields

src/infrastructure/erpnext/healthcare.py

@@ -208,7 +208,9 @@ class ERPNextHealthcare:
         appointment_date: str,
         appointment_time: str,
         duration: int = 30,
-        department: str = "Dermatología Estética",
+        department: str = "Dermatology",
+        appointment_type: str = "Consulta General",
+        appointment_for: str = "Practitioner",
         notes: str = "",
         service_unit: str | None = None,
     ) -> dict[str, Any]:
@@ -265,6 +267,8 @@ class ERPNextHealthcare:
             "appointment_time": appointment_time,
             "duration": duration,
             "department": department,
+            "appointment_type": appointment_type,
+            "appointment_for": appointment_for,
             "notes": notes,
             "status": "Scheduled",
         }