feat: jev 接入，判断创建、修改、问答、不明确四类意图

app/prompt/requirement.py

@@ -0,0 +1,24 @@
+"""需求节点的意图判断定义"""
+
+from app.schemas.decision import ChoiceDecision
+
+
+def build_intent_question() -> ChoiceDecision:
+    return ChoiceDecision(
+        # 判断主要意图；只有明确要求实际编辑时才判断为修改，不能仅根据选中节点判断
+        instructions=(
+            "Classify the user's primary intent. "
+            "Choose modify_screen only when the user explicitly requests an actual edit. "
+            "Do not infer editing solely from selected nodes."
+        ),
+        criteria={
+            # 创建新的大屏
+            "create_screen": "Create a new screen",
+            # 明确要求修改、增加、删除或重新设计已有大屏
+            "modify_screen": "Explicitly request modifying, adding, deleting, or redesigning an existing screen",
+            # 询问知识、原因、建议或如何修改，但没有要求实际执行
+            "qa": "Ask for information, reasons, suggestions, or how to improve something without requesting an actual edit",
+            # 无法判断意图或不属于上述类型
+            "unclear": "Intent is unclear or outside the above categories",
+        },
+    )