feat(saju-lab): lunar.py — 음력↔양력 변환 (sxtwl)

saju-lab/app/calculator/lunar.py

@@ -0,0 +1,23 @@
+"""음력↔양력 변환 — sxtwl 기반."""
+import sxtwl
+
+
+def solar_to_lunar(year: int, month: int, day: int) -> dict:
+    """양력 → 음력 변환. {'year', 'month', 'day', 'is_leap'} 반환."""
+    day_obj = sxtwl.fromSolar(year, month, day)
+    return {
+        "year": day_obj.getLunarYear(),
+        "month": day_obj.getLunarMonth(),
+        "day": day_obj.getLunarDay(),
+        "is_leap": bool(day_obj.isLunarLeap()),
+    }
+
+
+def lunar_to_solar(year: int, month: int, day: int, is_leap: bool = False) -> tuple[int, int, int]:
+    """음력 → 양력 변환. (year, month, day) tuple 반환."""
+    day_obj = sxtwl.fromLunar(year, month, day, is_leap)
+    return (
+        day_obj.getSolarYear(),
+        day_obj.getSolarMonth(),
+        day_obj.getSolarDay(),
+    )