Revert 253c922: restore the PM/RBAC work to the integration

Reverting the production revert so the pm branch can merge cleanly on
top of the restored RBAC base. Conflicts against newer integration work
resolved by combining:
- App.tsx: v7's bot-draft wizard bypass + login returnUrl kept alongside
  the supervisor gating (no-project block screen, panel scoping)
- LoginPage: returnUrl navigation kept, supervisor routing added
- migration.sql: bot_drafts table kept, unified-projects ALTERs restored

backend/app/routers/brands.py

@@ -3,6 +3,7 @@ from fastapi import APIRouter, Depends, Query
 from sqlalchemy import func, 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 Brand, BrandMaterial
 from app.schemas.catalog import BrandCreate, BrandUpdate
@@ -11,6 +12,7 @@ from app.utils.pagination import paginate, sort_query
 from app.utils.serialization import to_iso
 
 router = APIRouter(prefix="/brands", tags=["brands"])
+_procurement_writer = require_role("admin", "procurement_manager")
 
 
 def brand_to_dict(brand: Brand) -> dict:
@@ -42,7 +44,11 @@ async def list_brands(
 
 
 @router.post("", status_code=201)
-async def create_brand(payload: BrandCreate, db: AsyncSession = Depends(get_db)):
+async def create_brand(
+    payload: BrandCreate,
+    db: AsyncSession = Depends(get_db),
+    _auth=Depends(_procurement_writer),
+):
     rows = (await db.execute(select(Brand).where(Brand.name == payload.name))).scalars().all()
     if any(b.country == payload.country for b in rows):
         raise ConflictError("برندی با این نام و کشور قبلاً ثبت شده است")
@@ -61,7 +67,12 @@ async def get_brand(brand_id, db: AsyncSession = Depends(get_db)):
 
 
 @router.patch("/{brand_id}")
-async def update_brand(brand_id, payload: BrandUpdate, db: AsyncSession = Depends(get_db)):
+async def update_brand(
+    brand_id,
+    payload: BrandUpdate,
+    db: AsyncSession = Depends(get_db),
+    _auth=Depends(_procurement_writer),
+):
     brand = await db.get(Brand, brand_id)
     if brand is None:
         raise NotFoundError("برند یافت نشد")
@@ -79,7 +90,11 @@ async def update_brand(brand_id, payload: BrandUpdate, db: AsyncSession = Depend
 
 
 @router.delete("/{brand_id}")
-async def delete_brand(brand_id, db: AsyncSession = Depends(get_db)):
+async def delete_brand(
+    brand_id,
+    db: AsyncSession = Depends(get_db),
+    _auth=Depends(_procurement_writer),
+):
     brand = await db.get(Brand, brand_id)
     if brand is None:
         raise NotFoundError("برند یافت نشد")