Breadcrumbs: visible trail + BreadcrumbList JSON-LD

Add SeoJsonLd.Breadcrumb + Crumb record + _Breadcrumbs partial, and wire a trail
into the Jobs/Shifts list (landing) and detail pages: خانه › استخدام/شیفت › {نقش}
› {شهر|عنوان}. The role crumb links to the role landing page (more internal
links), and Google can show the breadcrumb path in results. Detail pages emit it
alongside the existing JobPosting JSON-LD.

Improvement 5 of the backlog (SEO).

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

src/JobsMedical.Web/Pages/Jobs/Details.cshtml

@@ -23,10 +23,14 @@
     if (j.SalaryMin is null && j.SalaryMax is null) salary = "توافقی";
     else if (j.SalaryMin == j.SalaryMax) salary = JalaliDate.Toman(j.SalaryMin) + " ماهانه";
     else salary = $"از {JalaliDate.ToPersianDigits((j.SalaryMin ?? 0).ToString("#,0"))} تا {JalaliDate.Toman(j.SalaryMax)} ماهانه";
+    var crumbs = new List<JobsMedical.Web.Services.Crumb> { new("خانه", "/"), new("استخدام", "/Jobs") };
+    if (j.Role is not null) crumbs.Add(new(j.Role.Name, "/استخدام/" + JobsMedical.Web.Services.SeoSlug.Of(j.Role.Name)));
+    crumbs.Add(new(j.Title, null));
 }
 
 <div class="page-head">
     <div class="container">
+        <partial name="_Breadcrumbs" model="crumbs" />
         <div class="row" style="display:flex; gap:10px; align-items:center;">
             <span class="badge badge-job">@empLabel</span>
             @if (j.Role is not null) { <span class="badge badge-type">@j.Role.Name</span> }
@@ -199,9 +203,10 @@
 @section Head {
     @* Only emit JobPosting structured data for a real named employer — Google for Jobs rejects a
        placeholder/empty hiringOrganization (most aggregated ads have no named center). *@
+    @{ var bu = $"{ViewContext.HttpContext.Request.Scheme}://{ViewContext.HttpContext.Request.Host}"; }
+    @Html.Raw("<script type=\"application/ld+json\">" + JobsMedical.Web.Services.SeoJsonLd.Breadcrumb(crumbs, bu) + "</script>")
     @if (JobsMedical.Web.Services.SeoJsonLd.HasRealEmployer(f))
     {
-        var bu = $"{ViewContext.HttpContext.Request.Scheme}://{ViewContext.HttpContext.Request.Host}";
         @Html.Raw("<script type=\"application/ld+json\">" + JobsMedical.Web.Services.SeoJsonLd.JobPosting(j, bu) + "</script>")
     }
 }

src/JobsMedical.Web/Pages/Jobs/Index.cshtml

@@ -6,6 +6,7 @@
 
 <div class="page-head">
     <div class="container">
+        <partial name="_Breadcrumbs" model="Model.Breadcrumbs" />
         <h1>@Model.PageHeading</h1>
         <p class="muted">
             @JalaliDate.ToPersianDigits(Model.Results.Count.ToString()) موقعیت شغلی پیدا شد
@@ -140,3 +141,8 @@
         }
     </script>
 }
+
+@section Head {
+    @{ var bcUrl = $"{ViewContext.HttpContext.Request.Scheme}://{ViewContext.HttpContext.Request.Host}"; }
+    @Html.Raw("<script type=\"application/ld+json\">" + JobsMedical.Web.Services.SeoJsonLd.Breadcrumb(Model.Breadcrumbs, bcUrl) + "</script>")
+}

src/JobsMedical.Web/Pages/Jobs/Index.cshtml.cs

@@ -37,6 +37,9 @@ public class IndexModel : PageModel
     /// <summary>A short unique intro shown on role/city landing pages (avoids thin-content).</summary>
     public string? PageIntro { get; private set; }
 
+    /// <summary>Breadcrumb trail (also emitted as BreadcrumbList JSON-LD).</summary>
+    public IReadOnlyList<Crumb> Breadcrumbs { get; private set; } = Array.Empty<Crumb>();
+
     public async Task<IActionResult> OnGetAsync()
     {
         Cities = await _db.Cities.Where(c => c.IsActive).OrderBy(c => c.Name).ToListAsync();
@@ -110,5 +113,10 @@ public class IndexModel : PageModel
             PageIntro = $"در این صفحه جدیدترین فرصت‌های {PageHeading}، گردآوری‌شده از منابع معتبر، را می‌بینید. "
                 + "روی هر آگهی بزنید تا جزئیات، شرایط و راهِ تماسِ مستقیم با مرکز درمانی نمایش داده شود. "
                 + "برای فرصت‌های مرتبط، نقش یا شهر دیگری را از لینک‌های بالا انتخاب کنید.";
+
+        var crumbs = new List<Crumb> { new("خانه", "/"), new("استخدام", "/Jobs") };
+        if (role is not null) crumbs.Add(new(role, "/استخدام/" + SeoSlug.Of(role)));
+        if (city is not null) crumbs.Add(new(city, null));
+        Breadcrumbs = crumbs;
     }
 }