Add gender requirement (آقا/خانم/فرقی نمی‌کند) + employee (کارجو) panel

- Gender enum + GenderRequirement on Shift/JobOpening + Gender on UserPreferences (migration)
- Employer PostShift/PostJob + admin Review have a gender select; parser detects آقا/خانم/مرد/زن
- Gender badge on cards + detail; gender filter on Shifts/Jobs; gender in preferences
- Recommendations exclude listings whose gender requirement conflicts with the person's gender
- Two panels: new /Me employee (کارجو) panel (recommendations + saved + applied + prefs) alongside /Employer; nav routes by role; /Account/Profile → /Me

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/JobsMedical.Web/Pages/Shared/_Layout.cshtml

@@ -39,7 +39,7 @@
                     {
                         <a asp-page="/Employer/Index" style="margin-inline-end:14px; font-weight:600;">پنل کارفرما</a>
                     }
-                    <a asp-page="/Account/Profile" style="margin-inline-end:10px; font-weight:600;">پروفایل</a>
+                    <a asp-page="/Me/Index" style="margin-inline-end:10px; font-weight:600;">پنل کارجو</a>
                     <form method="post" asp-page="/Account/Logout" style="display:inline;">
                         <button type="submit" class="btn btn-outline" style="padding:7px 14px;">خروج</button>
                     </form>