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/wwwroot/css/site.css

@@ -140,6 +140,7 @@ label { font-size: 13px; }
 .badge-type { background: #eef3f6; color: var(--muted); }
 .badge-distance { background: #fff1e8; color: #c5670f; }
 .badge-job { background: #eaf3ff; color: #2563eb; }
+.badge-gender { background: #f3eefb; color: #6b3fa0; }
 
 /* ---------- Filters layout ---------- */
 .layout-2 { display: grid; grid-template-columns: 270px 1fr; gap: 24px; align-items: start; }