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/Employer/PostShift.cshtml

@@ -39,6 +39,14 @@
                     }
                 </select>
             </div>
+            <div class="filter-group">
+                <label>جنسیت مورد نیاز</label>
+                <select name="GenderRequirement">
+                    <option value="0">فرقی نمی‌کند</option>
+                    <option value="1">آقا</option>
+                    <option value="2">خانم</option>
+                </select>
+            </div>
             <div class="filter-group">
                 <label>تاریخ (میلادی)</label>
                 <input type="date" name="Date" value="@Model.Date.ToString("yyyy-MM-dd")" dir="ltr" />