fix(HEL-488): 盘中日K补上今天实时变化的一根

悬浮窗和详情页在 Tushare rt_k / iFinD 不可用时，改用免费实时行情或当日分时生成今日K，收盘后正式日K就绪再无缝替换。

Co-authored-by: Cursor <cursoragent@cursor.com>
Co-authored-by: multica-agent <github@multica.ai>

backend/data/realtime.py

@@ -19,6 +19,8 @@ class RealtimeAggregateError(RuntimeError):
 
 
 EASTMONEY_INDEX_URL = "https://push2.eastmoney.com/api/qt/ulist.np/get"
+EASTMONEY_STOCK_URL = "https://push2.eastmoney.com/api/qt/stock/get"
+EASTMONEY_STOCK_FIELDS = "f43,f44,f45,f46,f47,f48,f57,f58,f60,f86,f168"
 EASTMONEY_SECTOR_URL = "https://push2.eastmoney.com/api/qt/clist/get"
 EASTMONEY_A_SHARE_BOARDS = (
     "m:0+t:6",
@@ -283,6 +285,42 @@ class WebRealtimeAggregator:
             )
         return self._filter_quotes_by_date(quotes, expected_date)
 
+    def tencent_stock_quote(self, code: str, expected_date: str = "") -> dict[str, Any]:
+        symbol, _secid, ts_code = _a_share_identity(code)
+        raw, _cache_age = self._get_text(
+            f"{TENCENT_QUOTE_URL}{symbol}",
+            referer="https://gu.qq.com/",
+            encoding="gb18030",
+        )
+        quote = next(
+            (
+                item
+                for line in raw.splitlines()
+                if (item := _parse_tencent_stock_quote(line))
+            ),
+            None,
+        )
+        if not quote:
+            raise RealtimeAggregateError(f"Tencent stock quote unavailable for {ts_code}")
+        return _require_quote_date(quote, expected_date)
+
+    def eastmoney_stock_quote(self, code: str, expected_date: str = "") -> dict[str, Any]:
+        _symbol, secid, ts_code = _a_share_identity(code)
+        payload = self._get_json(
+            EASTMONEY_STOCK_URL,
+            {
+                "secid": secid,
+                "invt": "2",
+                "fltt": "2",
+                "fields": EASTMONEY_STOCK_FIELDS,
+            },
+            referer="https://quote.eastmoney.com/",
+        )
+        quote = _normalize_eastmoney_stock_quote(payload.get("data") or {}, ts_code)
+        if not quote:
+            raise RealtimeAggregateError(f"Eastmoney stock quote unavailable for {ts_code}")
+        return _require_quote_date(quote, expected_date)
+
     def tencent_indices(self) -> list[dict[str, Any]]:
         raw, cache_age = self._get_text(
             TENCENT_INDEX_URL,
@@ -553,6 +591,55 @@ def _diff_rows(data: dict[str, Any]) -> list[dict[str, Any]]:
     return [row for row in diff if isinstance(row, dict)]
 
 
+def _a_share_identity(code: str) -> tuple[str, str, str]:
+    raw = str(code or "").strip().upper()
+    symbol = raw.split(".")[0]
+    if not symbol.isdigit() or len(symbol) != 6:
+        raise RealtimeAggregateError("Invalid stock code")
+    if raw.endswith(".SH") or symbol.startswith(("5", "6", "9")):
+        return f"sh{symbol}", f"1.{symbol}", f"{symbol}.SH"
+    if raw.endswith(".BJ") or symbol.startswith(("4", "8")):
+        return f"bj{symbol}", f"0.{symbol}", f"{symbol}.BJ"
+    return f"sz{symbol}", f"0.{symbol}", f"{symbol}.SZ"
+
+
+def _require_quote_date(quote: dict[str, Any], expected_date: str) -> dict[str, Any]:
+    want = str(expected_date or "").replace("-", "")
+    got = str(quote.get("quote_date") or "")
+    if want and got != want:
+        raise RealtimeAggregateError(f"quote date {got or 'empty'} is not {want}")
+    return quote
+
+
+def _normalize_eastmoney_stock_quote(
+    row: dict[str, Any], ts_code: str
+) -> dict[str, Any] | None:
+    close = _number(row.get("f43"))
+    previous_close = _number(row.get("f60"))
+    if close <= 0 or previous_close <= 0:
+        return None
+    epoch = int(_number(row.get("f86")))
+    quote_date = ""
+    if epoch > 0:
+        quote_date = datetime.fromtimestamp(epoch).astimezone().strftime("%Y%m%d")
+    return {
+        "ts_code": ts_code,
+        "name": row.get("f58") or ts_code.split(".")[0],
+        "pre_close": previous_close,
+        "open": _number(row.get("f46")),
+        "high": _number(row.get("f44")),
+        "low": _number(row.get("f45")),
+        "close": close,
+        "vol": _number(row.get("f47")) * 100,
+        "amount": _number(row.get("f48")),
+        "num": 0,
+        "quote_date": quote_date,
+        "quote_time_epoch": epoch,
+        "turnover_rate": _number(row.get("f168")),
+        "source": "eastmoney_stock",
+    }
+
+
 def _parse_tencent_stock_quote(line: str) -> dict[str, Any] | None:
     if '="' not in line:
         return None