feat(B09): 단가산출근거 · 목록표 — 승격 줄 · 옛 SP → 산근 블록 · B09 굳힌 단가 · 엑셀 끝수(145-1)

연결된 사본 일위대가 로직 줄 중 승격 + 옛 SP 참조 줄 · 같은 로직 + 같은 입력값 = 산근 하나 · 서버 단독 풀이 ·
대가 · 내역서가 읽는 길 sangeun_key · price_of · Linked.used_keys 빈 입력 = 자동값.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SE9MxeXTu2uaDZ55BJowAY

B09_Estimation/B09_Estimation_Router.py

@@ -9,7 +9,8 @@
 
 저장 자리 = 프로젝트 안 `B09_Estimation/v1/`(`B09_Estimation_Store`) ·
 단가 = `B09_Estimation_Prices` ·
-수요 = `B09_Estimation_Linked`(연결된 사본) · 셈 = `B09_Estimation_Calc_*`(화면 짝과 같은 식).
+수요 = `B09_Estimation_Linked`(연결된 사본) · 셈 = `B09_Estimation_Calc_*`(화면 짝과 같은 식) ·
+산근 = `B09_Estimation_Sangeun`(서버 단독 · 145-1 · 화면은 받은 그대로).
 """
 
 from __future__ import annotations
@@ -24,6 +25,7 @@ from fastapi import APIRouter, Body
 from B08_Quantity.B08_Quantity_Router_Hydro import _project_root
 from B08_Quantity.B08_Quantity_Router_Material import material_sheets
 from B09_Estimation import B09_Estimation_Prices as prices
+from B09_Estimation import B09_Estimation_Sangeun as sangeun
 from B09_Estimation import B09_Estimation_Store as store
 from B09_Estimation.B09_Estimation_Calc_Base import compute_base
 from B09_Estimation.B09_Estimation_Linked import linked_resource_keys
@@ -53,11 +55,14 @@ async def payload(project_id: UUID, root: Path) -> dict[str, Any]:
     book = await asyncio.to_thread(store.read_book, root)
     inputs = await asyncio.to_thread(prices.build_inputs, book, keys, b08["materials"])
     user = await asyncio.to_thread(store.read_user, root)
+    sheets = compute_base(inputs, user)
+    sheets.update(await asyncio.to_thread(sangeun.build, root, sheets))  # 145-1 — 굳힌 단가로 풀이
+    sheets["gaps"] = [*sheets["gaps"], *sheets["sg_gaps"]]
     return {
         "inputs": inputs,
         "user": user,
         "book": {"made": book.get("made")} if book else None,
-        "sheets": compute_base(inputs, user),
+        "sheets": sheets,
         "notes": notes,
     }