Add HKO-backed Shek Kong settlement and history support

src/analysis/settlement_rounding.py

@@ -23,14 +23,21 @@ def is_exact_settlement_city(city: str) -> bool:
     """是否为不四舍五入的精确结算城市"""
     if not city:
         return False
-    c = str(city).lower().strip()
-    return c in ["hong kong", "hk", "香港"]
+    normalized = str(city).lower().strip()
+    try:
+        from src.data_collection.city_registry import ALIASES, CITY_REGISTRY
+
+        canonical = ALIASES.get(normalized, normalized)
+        city_meta = CITY_REGISTRY.get(canonical) or {}
+        return str(city_meta.get("settlement_source") or "").strip().lower() == "hko"
+    except Exception:
+        return normalized in ["hong kong", "hk", "香港"]
 
 
 def apply_city_settlement(city: str, value: Optional[Number]) -> Optional[int]:
     """
     根据城市返回最终的结算值：
-    - 香港: 向下取整 (e.g. 28.9 -> 28)
+    - HKO 系城市: 向下取整 (e.g. 28.9 -> 28)
     - 其他: WU 规则四舍五入
     """
     if value is None: