feat(562-2): D03 노선 정본 GET · PUT 응답에 year_start(사업연도 시작) — 조각 연도 고름 처음 값

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

D03_PlanAnalysis/D03_PlanAnalysis_Network.py

@@ -269,10 +269,13 @@ async def _load(connection: Any, project_id: UUID) -> tuple[dict[str, Any] | Non
     return legacy, legacy is not None
 
 
-def _view(network: dict[str, Any] | None, legacy: bool, base: dict[str, Any]) -> dict[str, Any]:
+def _view(
+    network: dict[str, Any] | None, legacy: bool, base: dict[str, Any], year_start: int | None
+) -> dict[str, Any]:
     return {
         "status": "success",
         "base": base,
+        "year_start": year_start,
         "network": network,
         "derived": derive(network) if network else None,
         "legacy": legacy,
@@ -284,8 +287,13 @@ async def get_plan_network(project_id: UUID) -> dict[str, Any]:
     base = await plan_base.load_base(project_id)
     async with get_db_pool().acquire() as connection:
         network, legacy = await _load(connection, project_id)
+        async with connection.cursor(aiomysql.DictCursor) as cursor:
+            await cursor.execute(
+                "SELECT project_year FROM projects WHERE id = %s", (str(project_id),)
+            )
+            row = await cursor.fetchone()
     try:
-        return _view(network, legacy, base)
+        return _view(network, legacy, base, row["project_year"] if row else None)
     except NetworkError as error:
         raise HTTPException(status_code=409, detail=f"저장된 노선이 틀립니다 — {error}") from error
 
@@ -425,4 +433,4 @@ async def put_plan_network(
         except Exception:
             await connection.rollback()
             raise
-    return {**_view(network, False, base), "derived": derived}
+    return {**_view(network, False, base, project["project_year"]), "derived": derived}