feat(dashboard): add sourced knowledge chat

resources/tester/test_b01_knowledge_chat.py

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+import asyncio
+
+from B01_Dashboard import B01_Dashboard_Knowledge_Chat as chat
+
+
+def test_chat_excludes_practice_documents_from_gemini(monkeypatch, tmp_path):
+    public = tmp_path / "법률"
+    private = tmp_path / "실무문서"
+    public.mkdir()
+    private.mkdir()
+    (public / "현행.md").write_text("# 임도 기준\n" + "임도 설치 기준 내용 " * 10, encoding="utf-8")
+    (private / "사례.md").write_text("# 임도 기준\n비공개 사례 " * 10, encoding="utf-8")
+    monkeypatch.setattr(chat, "ORIGINAL", tmp_path)
+    monkeypatch.setenv("GEMINI_API_KEY", "test-key")
+    chat._sections.cache_clear()
+    sent = {}
+
+    class Response:
+        def raise_for_status(self):
+            pass
+
+        def json(self):
+            return {"candidates": [{"content": {"parts": [{"text": "설명 [1]"}]}}]}
+
+    class Client:
+        def __init__(self, timeout):
+            pass
+
+        async def __aenter__(self):
+            return self
+
+        async def __aexit__(self, *_args):
+            pass
+
+        async def post(self, url, *, headers, json):
+            sent["prompt"] = json["contents"][0]["parts"][0]["text"]
+            return Response()
+
+    monkeypatch.setattr(chat.httpx, "AsyncClient", Client)
+    result = asyncio.run(chat.ask_knowledge_chat(chat.ChatRequest(question="임도 기준"), {}))
+    assert result["answer"] == "설명 [1]"
+    assert result["sources"][0]["path"] == "법률/현행.md"
+    assert "실무문서" not in sent["prompt"]
+    assert "비공개 사례" not in sent["prompt"]
+    chat._sections.cache_clear()