SEO landing pages: dynamic role+city titles, pretty URLs, sitemap combos

Google Search Console shows all top queries are «استخدام [نقش] [شهر]», but the
filtered index pages all shared the generic title «موقعیت‌های استخدامی» and
weren't in the sitemap, so nothing ranked for those exact searches.

- Jobs/Shifts/Talent index pages now set a dynamic <title>/<h1>/meta from the
  active role+city (e.g. «استخدام پزشک عمومی در تهران»).
- Pretty SEO routes /استخدام/{role}/{city?} and /شیفت/{role}/{city?} (via
  AddPageRoute) resolve slugs → filters; unknown slug → 404. The layout already
  derives the canonical from the path, so each pretty URL is its own canonical
  and the query-string forms canonicalize to /Jobs (no duplicate content).
- sitemap.xml now lists role-only and role×city landing URLs for every combo
  with live listings (URL-encoded), so Google discovers them.
- New SeoSlug helper (Persian-tolerant: ي/ك, ZWNJ, hyphen/space).

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

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

@@ -20,6 +20,10 @@ public class IndexModel : PageModel
     [BindProperty(SupportsGet = true)] public double? Lat { get; set; }
     [BindProperty(SupportsGet = true)] public double? Lng { get; set; }
 
+    // Pretty-URL segments (/استخدام/{roleSlug}/{citySlug?}); resolved to RoleId/CityId below.
+    [BindProperty(SupportsGet = true)] public string? RoleSlug { get; set; }
+    [BindProperty(SupportsGet = true)] public string? CitySlug { get; set; }
+
     public bool NearMeActive => Lat is not null && Lng is not null;
 
     public List<JobOpening> Results { get; private set; } = new();
@@ -27,10 +31,29 @@ public class IndexModel : PageModel
     public List<District> Districts { get; private set; } = new();
     public List<Role> Roles { get; private set; } = new();
 
-    public async Task OnGetAsync()
+    /// <summary>Dynamic page heading/H1 + title, set from the active role/city for SEO.</summary>
+    public string PageHeading { get; private set; } = "موقعیت‌های استخدامی";
+
+    public async Task<IActionResult> OnGetAsync()
     {
         Cities = await _db.Cities.Where(c => c.IsActive).OrderBy(c => c.Name).ToListAsync();
         Roles = await _db.Roles.Where(r => r.IsActive).OrderBy(r => r.SortOrder).ToListAsync();
+
+        // Pretty-URL landing: resolve slugs → filters. A slug matching nothing is a 404 (don't
+        // render a thin page under a junk URL).
+        if (!string.IsNullOrWhiteSpace(RoleSlug))
+        {
+            var role = Roles.FirstOrDefault(r => SeoSlug.Matches(r.Name, RoleSlug));
+            if (role is null) return NotFound();
+            RoleId = role.Id;
+        }
+        if (!string.IsNullOrWhiteSpace(CitySlug))
+        {
+            var city = Cities.FirstOrDefault(c => SeoSlug.Matches(c.Name, CitySlug));
+            if (city is null) return NotFound();
+            CityId = city.Id;
+        }
+
         Districts = await _db.Districts
             .Where(d => d.IsActive && (CityId == null || d.CityId == CityId))
             .OrderBy(d => d.Name).ToListAsync();
@@ -63,5 +86,22 @@ public class IndexModel : PageModel
         {
             Results = results.OrderByDescending(j => j.CreatedAt).ToList();
         }
+
+        SetSeo(Roles.FirstOrDefault(r => r.Id == RoleId)?.Name, Cities.FirstOrDefault(c => c.Id == CityId)?.Name);
+        return Page();
+    }
+
+    /// <summary>Title/H1/meta from the active role+city so the page targets «استخدام [نقش] [شهر]».</summary>
+    private void SetSeo(string? role, string? city)
+    {
+        PageHeading =
+            role is not null && city is not null ? $"استخدام {role} در {city}"
+            : role is not null ? $"استخدام {role}"
+            : city is not null ? $"استخدام کادر درمان در {city}"
+            : "موقعیت‌های استخدامی";
+        ViewData["Title"] = PageHeading;
+        ViewData["Description"] = role is not null || city is not null
+            ? $"جدیدترین آگهی‌های {PageHeading} در همکادر؛ مشاهده فرصت‌ها و تماس مستقیم با مراکز درمانی."
+            : "موقعیت‌های استخدامی کادر درمان (پزشک، پرستار، ماما، تکنسین) در بیمارستان‌ها و کلینیک‌های تهران — همکادر.";
     }
 }