Fix CTP exchange routing for non-SHFE contracts and duplicate trade closes.

Resolve CZCE/DCE symbols to the correct exchange for orders, dedupe stop-loss closes and trade logs, and rely on CTP sync for authoritative records.

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

ctp_symbol.py

@@ -32,8 +32,12 @@ def ths_to_vnpy_symbol(ths_code: str) -> Tuple[str, str]:
     """
     code = (ths_code or "").strip()
     codes = ths_to_codes(code)
-    ex = (codes.get("ex") if codes else None) or "SHFE"
-    ex = _EX_MAP.get(ex, "SHFE")
+    ex = (codes.get("ex") if codes else None)
+    if not ex and codes:
+        mc = (codes.get("market_code") or "")
+        if "." in mc:
+            ex = mc.rsplit(".", 1)[-1]
+    ex = _EX_MAP.get(ex or "SHFE", "SHFE")
     m = re.match(r"^([A-Za-z]+)(\d+)$", code)
     if not m:
         return code, ex