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/quote_events.py

@@ -3,7 +3,6 @@ from fastapi import APIRouter, Depends, Query
 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 Quote, QuoteEvent
 from app.schemas.procurement import NoteEventIn
@@ -12,7 +11,6 @@ from app.utils.errors import NotFoundError, ValidationError
 from app.utils.pagination import paginate, sort_query
 
 router = APIRouter(prefix="/quotes/{quote_id}/events", tags=["quote-events"])
-_procurement_writer = require_role("admin", "procurement_manager")
 
 
 @router.get("")
@@ -36,12 +34,7 @@ async def list_events(
 
 
 @router.post("", status_code=201)
-async def create_event(
-    quote_id,
-    payload: NoteEventIn,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
-):
+async def create_event(quote_id, payload: NoteEventIn, db: AsyncSession = Depends(get_db)):
     quote = await db.get(Quote, quote_id)
     if quote is None:
         raise NotFoundError("پیشنهاد (استعلام) یافت نشد")