feat(stock-webai): /api/webai/news-sentiment daily dump

JOINs news_sentiment with krx_master for name fallback. Sorted by
score DESC. Date param defaults to latest. Empty table returns
{date: null, count: 0, items: []}. 4 integration tests pass.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

stock/app/main.py

@@ -405,6 +405,54 @@ def get_webai_portfolio():
     return _augment_portfolio_with_pnl_pct(get_portfolio())
 
 
+def _fetch_news_sentiment_dump(date: str | None) -> dict:
+    """news_sentiment 일별 dump (krx_master JOIN, score DESC)."""
+    from .db import _conn
+    conn = _conn()
+    try:
+        # 1) date resolve — None 이면 최신 date
+        if date is None:
+            row = conn.execute(
+                "SELECT MAX(date) FROM news_sentiment"
+            ).fetchone()
+            date = row[0] if row and row[0] else None
+
+        if date is None:
+            return {"date": None, "count": 0, "items": []}
+
+        # 2) JOIN krx_master.name (없으면 ticker 그대로)
+        rows = conn.execute(
+            """
+            SELECT ns.ticker,
+                   COALESCE(km.name, ns.ticker) AS name,
+                   ns.score_raw,
+                   ns.reason,
+                   ns.news_count,
+                   ns.source
+            FROM news_sentiment ns
+            LEFT JOIN krx_master km ON km.ticker = ns.ticker
+            WHERE ns.date = ?
+            ORDER BY ns.score_raw DESC
+            """,
+            (date,)
+        ).fetchall()
+    finally:
+        conn.close()
+
+    items = [
+        {"ticker": r[0], "name": r[1], "score": r[2],
+         "reason": r[3], "news_count": r[4], "source": r[5]}
+        for r in rows
+    ]
+    return {"date": date, "count": len(items), "items": items}
+
+
+@app.get("/api/webai/news-sentiment", dependencies=[Depends(verify_webai_key)])
+def get_webai_news_sentiment(date: str | None = None):
+    """web-ai 전용 news sentiment 일별 dump."""
+    return _fetch_news_sentiment_dump(date)
+
+
 @app.post("/api/portfolio", status_code=201)
 def create_portfolio_item(req: PortfolioItemRequest):
     """포트폴리오 종목 추가"""