feat(hub): exchange price precision, entry price, and trend DCA display

Co-authored-by: Cursor <cursoragent@cursor.com>

tests/test_trend_hub_enrich.py

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+"""趋势回调中控 enrich：补仓次数与加仓价。"""
+from __future__ import annotations
+
+import json
+import sys
+import unittest
+from pathlib import Path
+from unittest.mock import MagicMock
+
+ROOT = Path(__file__).resolve().parents[1]
+sys.path.insert(0, str(ROOT))
+
+from strategy_trend_register import _trend_add_leg_fields  # noqa: E402
+
+
+class TestTrendHubEnrich(unittest.TestCase):
+    def test_add_count_and_prices(self):
+        mock_ex = MagicMock()
+        mock_ex.price_to_precision = lambda sym, px: f"{float(px):.4f}"
+        app_mod = MagicMock()
+        app_mod.exchange = mock_ex
+        app_mod.ensure_markets_loaded = MagicMock()
+        app_mod.normalize_exchange_symbol = lambda s: s
+        cfg = {"app_module": app_mod}
+        raw = {
+            "symbol": "ETH/USDT",
+            "exchange_symbol": "ETH/USDT:USDT",
+            "legs_done": 2,
+            "dca_legs": 5,
+            "grid_prices_json": json.dumps([1800.1, 1750.2, 1700.3]),
+            "stop_loss": 1600,
+            "take_profit": 2000,
+            "avg_entry_price": 1820.5,
+        }
+        out = _trend_add_leg_fields(cfg, raw)
+        self.assertEqual(out["add_count"], 2)
+        self.assertEqual(out["add_count_total"], 5)
+        self.assertEqual(out["add_prices"], [1800.1, 1750.2])
+        self.assertEqual(len(out["add_prices_display"]), 2)
+        self.assertEqual(out["stop_loss_display"], "1600.0000")
+
+
+if __name__ == "__main__":
+    unittest.main()