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

backend/app/routers/line_item_specs.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.catalog import AttributeDefinition, Unit
 from app.models.procurement import LineItem, LineItemSpec, Quote
@@ -12,6 +13,7 @@ from app.services.eav_service import flatten_eav_values
 from app.utils.errors import ConflictError, NotFoundError
 
 router = APIRouter(prefix="/quotes/{quote_id}/line-items/{line_item_id}/specs", tags=["line-item-specs"])
+_procurement_writer = require_role("admin", "procurement_manager")
 
 
 async def _line_item_or_404(db: AsyncSession, quote_id, line_item_id) -> LineItem:
@@ -53,7 +55,13 @@ async def get_line_item_specs(quote_id, line_item_id, db: AsyncSession = Depends
 
 
 @router.put("")
-async def put_line_item_specs(quote_id, line_item_id, payload: SpecsPutIn, db: AsyncSession = Depends(get_db)):
+async def put_line_item_specs(
+    quote_id,
+    line_item_id,
+    payload: SpecsPutIn,
+    db: AsyncSession = Depends(get_db),
+    _auth=Depends(_procurement_writer),
+):
     """FULL replacement — specs not in the payload are DELETED (P1-19)."""
     async with db.begin():
         li = await _line_item_or_404(db, quote_id, line_item_id)