Fix empty hrefs on nav and homepage «مشاهده همه» links

The SEO routes added a required slug («شیفت/{roleSlug}»), which made asp-page=/Shifts/Index
and /Jobs/Index generate an EMPTY href whenever no slug was supplied — so the nav «شیفت‌ها/
استخدام» and the homepage «مشاهده همه» links did nothing (Talent, which has no custom route, worked).
Fix: make the slug optional ({roleSlug?}) so URL generation succeeds, and point the nav + homepage
view-all links at the plain /Shifts and /Jobs routes as a guaranteed fallback.

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

src/JobsMedical.Web/Pages/Index.cshtml

@@ -79,7 +79,7 @@
     <div class="container">
         <div class="section-head">
             <h2>جدیدترین شیفت‌ها</h2>
-            <a asp-page="/Shifts/Index">مشاهده همه ←</a>
+            <a href="/Shifts">مشاهده همه ←</a>
         </div>
         @if (Model.LatestShifts.Count == 0)
         {
@@ -103,7 +103,7 @@
         <div class="container">
             <div class="section-head">
                 <h2>فرصت‌های استخدامی</h2>
-                <a asp-page="/Jobs/Index">مشاهده همه ←</a>
+                <a href="/Jobs">مشاهده همه ←</a>
             </div>
             <div class="grid grid-3">
                 @foreach (var j in Model.LatestJobs)

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

@@ -111,8 +111,8 @@
             <div class="nav-collapse">
                 <nav class="main-nav">
                     <a asp-page="/Index" class="@(path == "/" ? "active" : null)">خانه</a>
-                    <a asp-page="/Shifts/Index" data-tour="shifts" class="@(path.StartsWith("/Shifts") ? "active" : null)">شیفت‌ها</a>
-                    <a asp-page="/Jobs/Index" data-tour="jobs" class="@(path.StartsWith("/Jobs") ? "active" : null)">استخدام</a>
+                    <a href="/Shifts" data-tour="shifts" class="@(path.StartsWith("/Shifts") ? "active" : null)">شیفت‌ها</a>
+                    <a href="/Jobs" data-tour="jobs" class="@(path.StartsWith("/Jobs") ? "active" : null)">استخدام</a>
                     <a asp-page="/Talent/Index" class="@(path.StartsWith("/Talent") ? "active" : null)">آماده به کار</a>
                     <a asp-page="/Facilities/Index" class="@(path.StartsWith("/Facilities") ? "active" : null)">مراکز درمانی</a>
                     <a asp-page="/Calendar/Index" class="@(path.StartsWith("/Calendar") ? "active" : null)">تقویم هفتگی</a>

src/JobsMedical.Web/Program.cs

@@ -16,8 +16,11 @@ builder.Services.AddRazorPages(options =>
 {
     // Pretty SEO landing routes that target «استخدام [نقش] [شهر]» / «شیفت …» searches, in addition
     // to the query-string forms (/Jobs?RoleId=…&CityId=…). The page resolves the slugs to filters.
-    options.Conventions.AddPageRoute("/Jobs/Index", "استخدام/{roleSlug}/{citySlug?}");
-    options.Conventions.AddPageRoute("/Shifts/Index", "شیفت/{roleSlug}/{citySlug?}");
+    // roleSlug is OPTIONAL: a required slug made `asp-page="/Shifts/Index"` (with no slug) generate an
+    // empty href, breaking the nav «شیفت‌ها/استخدام» and the homepage «مشاهده همه» links. Optional →
+    // generation succeeds (e.g. «/شیفت») and the slug landing pages still work.
+    options.Conventions.AddPageRoute("/Jobs/Index", "استخدام/{roleSlug?}/{citySlug?}");
+    options.Conventions.AddPageRoute("/Shifts/Index", "شیفت/{roleSlug?}/{citySlug?}");
 });
 
 // Interest tracking + recommendation engine.