fix(chat): answer greetings without search

B01_Dashboard/B01_Dashboard_Knowledge_Chat.py

@@ -76,6 +76,9 @@ def search(question: str) -> list[dict[str, str]]:
 
 @router.post("")
 async def ask_knowledge_chat(payload: ChatRequest, _session=Depends(verify_session)):
+    if re.fullmatch(r"\s*(안녕|안녕하세요|하이|hi|hello)[!！?？.\s]*", payload.question, re.I):
+        return {"answer": "안녕하세요! 법령이나 지침에 대해 궁금한 점을 물어보세요.", "sources": []}
+
     sources = search(payload.question)
     if not sources:
         return {

resources/tester/test_b01_knowledge_chat.py

@@ -3,6 +3,18 @@ import asyncio
 from B01_Dashboard import B01_Dashboard_Knowledge_Chat as chat
 
 
+def test_greeting_answers_without_search_or_api_key(monkeypatch):
+    monkeypatch.delenv("GEMINI_API_KEY", raising=False)
+    monkeypatch.setattr(
+        chat, "search", lambda _question: (_ for _ in ()).throw(AssertionError("searched"))
+    )
+    result = asyncio.run(chat.ask_knowledge_chat(chat.ChatRequest(question="안녕!"), {}))
+    assert result == {
+        "answer": "안녕하세요! 법령이나 지침에 대해 궁금한 점을 물어보세요.",
+        "sources": [],
+    }
+
+
 def test_chat_searches_all_knowledge_markdown_except_excluded_folders(monkeypatch, tmp_path):
     public = tmp_path / "original" / "법률"
     guide = tmp_path / "technical_info"