fix: split screenshot field from log field in issue templates

render: shell blocks image paste/drag — separate into a plain textarea
so users can attach screenshots directly.

.github/ISSUE_TEMPLATE/database_compatibility.yml

@@ -89,6 +89,12 @@ body:
     validations:
       required: true
 
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: 截图
+      description: 可直接粘贴或拖入截图。
+
   - type: textarea
     id: expected
     attributes: