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.

frontend/src/components/PanelMenu.tsx

@@ -6,8 +6,6 @@ import { cn } from "../lib/utils";
 export interface MenuItem {
   label?: string;
   to?: string;
-  // لینک خارجی (اپ جداگانه، مثل سامانه PM) — در تب جدید باز می‌شود
-  href?: string;
   active?: boolean;
   divider?: boolean;
   onClick?: () => void;
@@ -114,21 +112,6 @@ export function PanelMenu({ items, title }: { items: MenuItem[]; title?: string
                   </div>
                 )}
               </div>
-            ) : it.href ? (
-              <a
-                key={i}
-                href={it.href}
-                target="_blank"
-                rel="noopener noreferrer"
-                onClick={() => setOpen(false)}
-                className={cn(
-                  "flex items-center justify-between gap-3 rounded-lg px-3 py-2 text-[13px] no-underline",
-                  it.active ? "bg-accent font-bold text-white" : "text-ink hover:bg-slate-bg",
-                )}
-              >
-                {it.label}
-                <span aria-hidden className="text-[10px] opacity-60">↗</span>
-              </a>
             ) : it.to ? (
               <Link
                 key={i}