feat(stock): session 판정 + webai monitor-set 엔드포인트

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EqCYBhvTcdeCTUDX3RhWx9

stock/tests/test_trade_alerts_monitorset_api.py

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+import datetime as dt
+import pytest
+from fastapi.testclient import TestClient
+
+
+def test_current_session_windows():
+    from app.trade_alerts import current_session
+    d = dt.date(2026, 7, 2)
+    assert current_session(dt.datetime.combine(d, dt.time(8, 40))) == "pre"
+    assert current_session(dt.datetime.combine(d, dt.time(10, 0))) == "regular"
+    assert current_session(dt.datetime.combine(d, dt.time(17, 0))) == "after"
+    assert current_session(dt.datetime.combine(d, dt.time(20, 0))) == "closed"
+
+
+@pytest.fixture
+def client(monkeypatch, tmp_path):
+    from app import db as _db
+    monkeypatch.setattr(_db, "DB_PATH", str(tmp_path / "stock.db"))
+    _db.init_db()
+    monkeypatch.setenv("WEBAI_API_KEY", "k")
+    from app.main import app
+    return TestClient(app)
+
+
+def test_monitor_set_requires_auth(client):
+    assert client.get("/api/webai/trade-alert/monitor-set").status_code == 401
+
+
+def test_monitor_set_ok(client):
+    r = client.get("/api/webai/trade-alert/monitor-set", headers={"X-WebAI-Key": "k"})
+    assert r.status_code == 200
+    body = r.json()
+    assert body["session"] in ("pre", "regular", "after", "closed")
+    assert "buy_targets" in body and "sell_targets" in body
+    assert body["exit_params"]["trailing_pct"] == 0.10