feat(rbac): enforce procurement write restrictions and support supervisor role in SSO

backend/app/routers/item_receipts.py

@@ -3,6 +3,7 @@ from fastapi import APIRouter, Depends
 from sqlalchemy import select
 from sqlalchemy.ext.asyncio import AsyncSession
 
+from app.auth import require_role
 from app.db.engine import get_db
 from app.models.procurement import ItemDecision, ItemReceipt, LineItem
 from app.schemas.procurement import ReceiptCreate, ReceiptUpdate
@@ -14,6 +15,7 @@ router = APIRouter(
     prefix="/quotes/{quote_id}/line-items/{line_item_id}/receipt",
     tags=["item-receipts"],
 )
+_procurement_writer = require_role("admin", "procurement_manager")
 
 
 async def _line_item_or_404(db: AsyncSession, quote_id, line_item_id) -> LineItem:
@@ -45,7 +47,13 @@ async def get_receipt(quote_id, line_item_id, db: AsyncSession = Depends(get_db)
 
 
 @router.post("", status_code=201)
-async def create_receipt(quote_id, line_item_id, payload: ReceiptCreate, db: AsyncSession = Depends(get_db)):
+async def create_receipt(
+    quote_id,
+    line_item_id,
+    payload: ReceiptCreate,
+    db: AsyncSession = Depends(get_db),
+    _auth=Depends(_procurement_writer),
+):
     await _line_item_or_404(db, quote_id, line_item_id)
     decision = await _decision_or_404(db, line_item_id)
     existing = await db.scalar(select(ItemReceipt).where(ItemReceipt.item_decision_id == decision.id))
@@ -65,7 +73,13 @@ async def create_receipt(quote_id, line_item_id, payload: ReceiptCreate, db: Asy
 
 
 @router.patch("")
-async def update_receipt(quote_id, line_item_id, payload: ReceiptUpdate, db: AsyncSession = Depends(get_db)):
+async def update_receipt(
+    quote_id,
+    line_item_id,
+    payload: ReceiptUpdate,
+    db: AsyncSession = Depends(get_db),
+    _auth=Depends(_procurement_writer),
+):
     await _line_item_or_404(db, quote_id, line_item_id)
     decision = await db.scalar(select(ItemDecision).where(ItemDecision.line_item_id == line_item_id))
     if decision is None: