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/suppliers.py

@@ -3,7 +3,6 @@ from fastapi import APIRouter, Depends, Query
 from sqlalchemy import func, or_, 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 MaterialCategory
 from app.models.procurement import Quote, Supplier
@@ -13,7 +12,6 @@ from app.utils.pagination import paginate, sort_query
 from app.utils.serialization import to_iso
 
 router = APIRouter(prefix="/suppliers", tags=["suppliers"])
-_procurement_writer = require_role("admin", "procurement_manager")
 
 
 def supplier_to_dict(supplier: Supplier, category: MaterialCategory | None = None) -> dict:
@@ -73,11 +71,7 @@ async def list_suppliers(
 
 
 @router.post("", status_code=201)
-async def create_supplier(
-    payload: SupplierCreate,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
-):
+async def create_supplier(payload: SupplierCreate, db: AsyncSession = Depends(get_db)):
     category = await _category_or_404(db, payload.category_id)
     supplier = Supplier(
         name=payload.name,
@@ -102,12 +96,7 @@ async def get_supplier(supplier_id, db: AsyncSession = Depends(get_db)):
 
 
 @router.patch("/{supplier_id}")
-async def update_supplier(
-    supplier_id,
-    payload: SupplierUpdate,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
-):
+async def update_supplier(supplier_id, payload: SupplierUpdate, db: AsyncSession = Depends(get_db)):
     supplier = await db.get(Supplier, supplier_id)
     if supplier is None:
         raise NotFoundError("تأمین‌کننده یافت نشد")
@@ -131,11 +120,7 @@ async def update_supplier(
 
 
 @router.delete("/{supplier_id}")
-async def delete_supplier(
-    supplier_id,
-    db: AsyncSession = Depends(get_db),
-    _auth=Depends(_procurement_writer),
-):
+async def delete_supplier(supplier_id, db: AsyncSession = Depends(get_db)):
     supplier = await db.get(Supplier, supplier_id)
     if supplier is None:
         raise NotFoundError("تأمین‌کننده یافت نشد")