[SEO] JobPosting structured data, canonical/OG meta, noindex private pages, fuller sitemap

Strategy = Google-for-Jobs + clean indexing. Add schema.org JobPosting JSON-LD to shift & job detail pages (title, description, datePosted, validThrough, employmentType, hiringOrganization, jobLocation, baseSalary) plus Organization + WebSite JSON-LD on the home page (SeoJsonLd helper; System.Text.Json => valid, script-safe). Layout emits per-page canonical, Open Graph + Twitter cards, and applies robots noindex,nofollow to all private/applicant areas (/Admin,/Me,/Employer,/Account,/Preferences) so applicant data is never indexed. robots.txt now disallows those + /resume,/avatar,/report,/push,/notifications and points at the sitemap; sitemap.xml adds facility pages + content pages (Download/Help/Privacy/Rules/Terms).

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

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

@@ -177,3 +177,8 @@
 {
     <partial name="_NeshanMap" model="Model.MapKey" />
 }
+
+@section Head {
+    @{ 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>")
+}