revert: restore production to the state before 730d0bd (PM/RBAC work moved to 'pm')

Their three commits (730d0bd, 5a9b543, 387edfb) reached production by push and
auto-deployed. 387edfb expects a users.username column that the live database does
not have, so POST /api/v1/auth/login was returning HTTP 500. Their schema changes
never applied either (projects still has only id, name, description, start_date,
pm_user_id, created_at), so nothing depends on the reverted code.

This commit sets the tree back to exactly a02b3ea — verified with git diff against
it — while keeping history linear: the work itself is preserved on 'pm' at 387edfb.

backend/app/routers/item_termsheets.py

@@ -7,7 +7,6 @@ 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,
@@ -24,7 +23,6 @@ router = APIRouter(
     prefix="/quotes/{quote_id}/line-items/{line_item_id}/termsheets",
     tags=["item-termsheets"],
 )
-_procurement_writer = require_role("admin", "procurement_manager")
 
 
 async def _line_item_or_404(db: AsyncSession, quote_id, line_item_id) -> LineItem:
@@ -60,11 +58,7 @@ async def list_item_termsheets(quote_id, line_item_id, db: AsyncSession = Depend
 
 @router.post("", status_code=201)
 async def create_item_termsheet(
-    quote_id,
-    line_item_id,
-    payload: ItemTermsheetCreate,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
+    quote_id, line_item_id, payload: ItemTermsheetCreate, db: AsyncSession = Depends(get_db)
 ):
     async with db.begin():
         li = await _line_item_or_404(db, quote_id, line_item_id)
@@ -99,12 +93,7 @@ async def create_item_termsheet(
 
 @router.patch("/{item_termsheet_id}")
 async def update_item_termsheet(
-    quote_id,
-    line_item_id,
-    item_termsheet_id,
-    payload: ItemTermsheetUpdate,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
+    quote_id, line_item_id, item_termsheet_id, payload: ItemTermsheetUpdate, db: AsyncSession = Depends(get_db)
 ):
     li = await _line_item_or_404(db, quote_id, line_item_id)
     quote = await db.get(Quote, quote_id)
@@ -125,11 +114,7 @@ async def update_item_termsheet(
 
 @router.delete("/{item_termsheet_id}")
 async def delete_item_termsheet(
-    quote_id,
-    line_item_id,
-    item_termsheet_id,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
+    quote_id, line_item_id, item_termsheet_id, db: AsyncSession = Depends(get_db)
 ):
     it = await db.scalar(
         select(ItemTermsheet).where(ItemTermsheet.id == item_termsheet_id, ItemTermsheet.line_item_id == line_item_id)