重构学员证书签发与批量导入流程

backend/app/schemas/certificate_template.py

@@ -1,10 +1,20 @@
 from pydantic import BaseModel
 
 
+class CertificateTemplateFieldOut(BaseModel):
+    key: str
+    label: str
+    field_type: str
+    required: bool
+    example: str
+    description: str
+
+
 class CertificateTemplateOut(BaseModel):
     code: str
     name: str
     description: str
     dynamic_fields: list[str]
+    fields: list[CertificateTemplateFieldOut]
     preview_url: str
     status: str