feat(org): panel-based access system replacing roles (procurement/inventory)

- new tables user_panels (panel: procurement/inventory/pm + level full/limited)
  and user_project_members (M:N membership, separate from pm responsibility)
- UserContext carries panels + member_project_ids; /users/me and the users
  list include them
- admin endpoints: PUT /users/{id}/panels, PUT /users/{id}/panel-projects
- inventory scope: panel inventory 'full' -> manager scope (all projects, NO
  stock change); 'limited' -> supervisor scope (own memberships, stock change
  allowed); legacy roles kept as migration fallback; admin untouched
- procurement writes: _procurement_writer is now panel-aware (admin, legacy
  procurement_manager, or procurement 'full') across all 18 write routers;
  quote CREATE additionally allows 'limited' users restricted to their member
  projects (validated server-side)
- frontend: panel-aware HomeRoute (inventory -> warehouse panel, procurement
  limited -> minimal RequesterHome), wizard project options restricted for
  limited users, change-inventory button/route gated to inventory 'limited',
  organization panel gains the panels & access-levels management section

backend/app/routers/inventory.py

@@ -76,9 +76,27 @@ async def inventory_scope(
     if request.headers.get("authorization"):
         user: UserContext = await get_optional_user(request, db)
         if user is not None:
-            if user.role is None:
-                raise ForbiddenError("نقش شما هنوز در سیستم تعیین نشده است")
-            # مدیر تدارکات و مدیر پروژه: دسترسی کامل به پنل انبار، اما فقط‌خواندنی در تغییر موجودی
+            panels = user.panels or {}
+            if user.role is None and not panels:
+                raise ForbiddenError("دسترسی شما هنوز در سیستم تعیین نشده است")
+            # ادمین: دست‌نخورده — همه‌چیز از جمله تغییر موجودی
+            if user.role == "admin":
+                return Scope(role="admin", project_id=project_id, actor=user.display_name)
+            # لایه پنل‌ها (جایگزین نقش‌ها): پنل انبار اولویت دارد
+            if "inventory" in panels:
+                if panels["inventory"] == "full":
+                    # کل سیستم و تمام پروژه‌ها — به‌جز تغییر موجودی
+                    return Scope(role="manager", project_id=project_id, actor=user.display_name, project_ids=list(user.member_project_ids or []))
+                # limited: فقط پروژه‌های عضویت + امکان تغییر موجودی
+                allowed = list(user.member_project_ids or [])
+                if not allowed:
+                    raise ForbiddenError("پروژه‌ای به شما تخصیص داده نشده است")
+                if project_id is not None:
+                    if project_id not in allowed:
+                        raise ForbiddenError("این پروژه به شما تخصیص داده نشده است")
+                    return Scope(role="supervisor", project_id=project_id, actor=user.display_name, project_ids=allowed)
+                return Scope(role="supervisor", project_id=allowed[0], actor=user.display_name, project_ids=allowed)
+            # مدیر تدارکات و مدیر پروژه (میراث): دسترسی کامل به پنل انبار، اما فقط‌خواندنی در تغییر موجودی
             if user.role in ("procurement_manager", "pm"):
                 return Scope(role="manager", project_id=project_id, actor=user.display_name, project_ids=list(user.project_ids or []))
             if user.role == "supervisor":